







la dimension fractale 
20000501 

François RIVOIRE, Julien CHOLLET et Alexandre DECOSTER pose la question : nous sommes étudiants en première année MPSI en école d'ingénieur ISEN ( Institut supérieur d'électronique du Nord ). Nous avons choisi les FRACTALES ( ou plus précisément sur la dimension fractale et topologique ainsi que sur les suites logistiques) comme sujet de TIPE; seraitil possible que vous nous envoyez des démonstrations mathématiques ou des conseils car jusqu'ici nous avons eût beaucoup de mal à trouver des démonstrations se rapportant à ce sujet, Claude Tardif lui répond. 





The dimensions of a rectangle 
20160831 

Hazym pose la question : How do I find the length(which is 15m longer than the breadth) and the breadth of a rectangle just by its perimeter which is 70 m? Penny Nom lui répond. 





The dimensions of a rectangle 
20160725 

Krunox pose la question : A rectangle is twice as long as it is wide. Its perimeter (the sum of the lengths of its sides) is 60 cm. Find its length and width. Penny Nom lui répond. 





A 1.4 acre square 
20160628 

Jamie pose la question : Dear Faithfullness,
I was previously to be purchasing a square 1 acre plot, which I believe was to have 209feet, 4 sides perimeter.
How big would a 1.4 acre site be?
In sq feet length ie original 209ft + (the adeed 0.4) Penny Nom lui répond. 





Dimes and pennies 
20160426 

Renae pose la question : Charity has 42 more pennies than dimes. Hope has 7 times as many pennies than dimes. Hope and Charity have the same number of dimes. Together they have $5.46. How many dimes and pennies do each have? Penny Nom lui répond. 





The dimensions of a rectangle 
20150925 

Erick pose la question : A rectangular strip of land has a perimeter of 124meters and an area of 385 square meters. Find its possible dimensions Penny Nom lui répond. 





The dimensions of a rectangle 
20140803 

Jamaica pose la question : if the perimeter of a rectangle is 30m and its area is 56 m2.find its length and width? Penny Nom lui répond. 





Tesseract 
20130822 

Dan pose la question : I am not a mathematician. This seems to me an intuitively simple enough problem that I very much need an answer to from someone who's mathematics are better than mine. Please help.
The question is: for a tesseract of side length = 1
what is the distance of the center of each cube from the center of the tesseract ?
I think I have calculated the distance of each vertex from the center, and of the center of each edge from the center, but the question above baffles me.
(anyone not having a clue what I am talking about can brush up here http://en.wikipedia.org/wiki/Tesseract )
Thanks in advance  Dan V Robert Dawson lui répond. 





How can we draw the equation "x+y=1" in 3d? 
20130503 

shimaa pose la question : how can we draw the equation "x+y=1" in 3d Robert Dawson lui répond. 





The distance between 2 lines in 4D 
20130401 

samane pose la question : how can i measure the distance between 2 lines in 4D?? Chris Fisher lui répond. 





The dimensions of a rectangle 
20130319 

stephanie pose la question : the length of a rectangle is 5m more than twice its width, and the area of the rectangle is 88m^2 find the demensions of the rectangle Penny Nom lui répond. 





A 12 acre parcel of land 
20121228 

John pose la question : What are the dimensions of a 12acre parcel if it is 3 square acres deep and 4 square acres wide? Penny Nom lui répond. 





The dimensions of a rectangle 
20120912 

Becky pose la question : A rectangle has an area of 48 square inches and perimeter of 32 inches. Find the dimensions of the rectangle. Penny Nom lui répond. 





The dimensions of a rectangle 
20120430 

Nikki pose la question : Name the dimensions of a rectangle that has the same area as this triangle?
I found the area of the triangle, which is 30. What do I have to do in order to complete this math problem? Penny Nom lui répond. 





A rectangular prism 
20120405 

Tori pose la question : How do you find the base height if the base width is 10ft. The height is 7ft. And the volume is105ft. Penny Nom lui répond. 





The dimensions of a rectangle 
20120313 

irvyn pose la question : if you are only given the area and the perimeter how do you find the dimension? Penny Nom lui répond. 





The dimensions of a conical tent 
20120304 

yash pose la question : a conical tent is to accommodate 11 people.Each person must have 4m square of space on the ground and 20m cube at air to breathe.Find the height and radius of the conical tent.26202 Penny Nom lui répond. 





The dimensions of a rectangle 
20120131 

Dazz pose la question : Hi I was wondering how to find the length of a rectangle if you know the area is 484 square inches And the length is 10 square inches or 22 square inches?
Thanks~Dazz Penny Nom lui répond. 





The dimensions of a rectangle 
20120106 

joseph pose la question : The perimeter of a rectangle is 72 inches. The length of the rectangle
is three more than 2 times the width of the rectangle. What is the
length of the rectangle? Write and solve an equation to determine the
dimension of the rectangle. Penny Nom lui répond. 





The dimensions of a rectangle 
20110508 

yolanda pose la question : If the length of a rectangle is 3ft less than twice its width and the area of the rectangle is 54ft^2,what are the dimensions of the rectangle? Penny Nom lui répond. 





The mass of a metal box 
20110311 

Pamela pose la question : A metal block has the dimensions of 3.16 inches wide, 2.15 inches
high, 4.98 inches long. What is the volume of the block in cm^3?
What is the block's mass if the metal has a density of 5.89g/cm^3. Robert Dawson lui répond. 





Find the dimension of the original rectangle 
20110228 

sandra pose la question : the perimeter of a rectangle is 40 cm. if the length were doubled and the width halved, the perimeter would be increased by 16cm. Find the dimension of the original rectangle Robert Dawson lui répond. 





Slicing a rectangular parallelepiped 
20110223 

tom pose la question : a) Pass a plane containing a vertex of a rectangular parallelepiped and a
diagonal of a face not containing that vertex to cut a pyramid from the
parallelepiped. What fraction of the volume of the parallelepiped is the
volume of the pyramid thus cut off?
b)Pass a plane through a cube of edge 8 in so that the section formed
will be a regular hexagon. Through each side of the hexagon pass two
planes, one plane containing one of the two vertices of the cube
which are farthest away from the plane of the hexagon, the other
plane containing the diagonally opposite vertex of the cube. Find the
volume of the solid bounded by these planes.
c)three of the edges of a rectangular parallelepiped that meet in a point
are also the lateral edges of a pyramid. What fraction of the parallelepiped
is this pyramid...?
you know the my only problem is how to illustrate this one...if only i
could ...can you help me....all I need is the drawing and I can do the rest
..it's fine if you'll only answer any of these but I'll be thankful if you
will do the three :).... Penny Nom lui répond. 





A rectangular solid 
20101208 

ryan pose la question : Good day!
Have a question on rectangular solids. We were asked to find the dimensions of a rectangular solid, we were only given the volume of the rectangular solid, the total area, and the altitude. I tried using the volume of the rectangular solid and was able to get the area of the base, but I don't know how to get its length and its width. Hope you could help me again. Thanks! Penny Nom lui répond. 





Nickels as dimes 
20101106 

Exie pose la question : Clara has the same number of nickels as dimes in each jar. there are 15 cent in one jar and 30 cents in the other. how many of each coin does she have in each jar?
I'm home schooling my granddaughter and this problem has me stumped..could you please help? thanks Robert Dawson lui répond. 





Nickels and dimes 
20101105 

kebede pose la question : John has 20 fewer nickels than dimes. The total of the nickels and dimes if $12.35. ow many of each coin does she have? Penny Nom lui répond. 





Tiles on a bedroom floor 
20101007 

Rochelle pose la question : John's bedroom floor is square in shape. He used 625 tiles, with a side length of 200 mm, to tile the whole floor.
Calculate the area and dimensions of the bedroom Penny Nom lui répond. 





A shrunken car 
20100731 

Diana pose la question : Car manufacturers have outdone themselves. They have discovered how to shrink a car to make parking easier. At the touch of a button, a car shrinks by 2 feet in the width and 4 feet in the length. The original car base is 24 square feet longer than that of the shrunken car. If the original cars length is twice the width, find the dimensions of both cars. Identify the unknowns carefully. Penny Nom lui répond. 





The dimensions of a rectangle 
20100303 

Kirsten pose la question : A rectangle is twice as long as it is wide. Its area is 128 square meters. What are the dimensions of the rectangle? Tyler Wood lui répond. 





The dimensions of a flag 
20100215 

dawn pose la question : a state flag was twice as long as it was wide and had an area of 288 sq inches, what were its, dimensions
Thanks Penny Nom lui répond. 





Can a line segment curve over two planes? 
20100214 

Graham pose la question : I am working on a math fair project.
Can a line segment curve over two planes?
Such as, if I had a three dimensional L bracket and I drew a line segment
on it with a marker starting on the bottom of the L and had it curve
around the corner and up the top, would it still be considered one line
segment? Or is that two line segments?
Is there a rule that a line segment can only occupy one plane?
Thank you.
Graham Chris Fisher lui répond. 





Matt has 40 coins 
20091118 

Amy pose la question : Matt has 40 coins(nickels, dimes, and quarters). The total amount is $4.05. He has 7
more nickels than dimes. How many quarters does he have? Penny Nom lui répond. 





Pennies and dimes 
20091111 

Rachel pose la question : Kesha had only pennies and dimes in her change purse. When she counted out her change she had 64 cents/ of she had 6 times as many pennies as she did dimes, how many pennies did she have? Write equation and solve it.
Can someone help me with this? Penny Nom lui répond. 





Pennies, nickels and dimes 
20090922 

Kiadadh pose la question : Show 12 ways to come up with 28 cents using only pennies, nickles and dimes Robert Dawson lui répond. 





Helen has twice as many dimes as nickles. 
20090908 

Dan pose la question : Helen has twice as many dimes as nickles. She has 5 more quarters than nickles. She has $4.75. How many nickles does she have? I know she has 14 dimes, 7 nickles and 12 quarters. How do you put this into an algebra equation? Stephen La Rocque lui répond. 





Nickels and dimes 
20090903 

MATTHEW pose la question : mike has 3 times as many nickels as Larry has dimes. Mike has 45 cents more than Larry. How much money does Mike have? Penny Nom lui répond. 





Nickels, dimes and quarters 
20090902 

danielle pose la question : In changing a $5 bill, Sarah received nine more dimes than nickles and seven fewer quarters than dimes. How many coins of each type did she receive? Penny Nom lui répond. 





Dimensions 
20090729 

Deborah pose la question : The blueprint for landscaping a yard has a scale of 1/2" to 1 foot. If the blueprint is a rectangle 18 inches by 22 inches, what are the dimensions of the yard? Robert Dawson lui répond. 





The dimensions of a cuboid 
20090624 

laura pose la question : a cuboid has the surface area of 842 cm2, can you work out the dimensions? Robert Dawson and Harley Weston lui répond. 





The dimensions of a rectangle 
20090530 

Linda pose la question : A rectangle has a perimeter of 38 feet & an area of 48 square feet. What are the dimensions of the rectangle? Stephen La Rocque lui répond. 





Nickels, dimes and quarters 
20090525 

Amy pose la question : Coming from South Africa I find working with nickels, dimes and quarters confusing.
How many dimes are in a nickel and how many quarters are in a dime? Penny Nom lui répond. 





The dimensions of a toy chest 
20090507 

charlotta pose la question : My son needs to find the 3 dimensions of a toy chest that has to have a volume of 24 cubic feet can you show how to get the answer Penny Nom lui répond. 





The volume of 3D figures 
20090429 

Serena pose la question : What is the formula for finding the volume of 3D figures Robert Dawson lui répond. 





Nickles and dimes 
20090417 

Emily pose la question : a vending machine contains nickels and dime coins which totals an amount of $14.50. There are 95 more nickels than the number of dime coins. How many of each coin does exist? Penny Nom lui répond. 





A rectangular open box 
20090321 

tina pose la question : An open box is to be made from a rectangular piece of tin by cutting two inches squares out of the corners and folding up the sides. The volume of the box will be 100 cubic inches. Find the dimensions of the rectangular piece of tin. Stephen La Rocque lui répond. 





A polyhedron 
20090310 

Mollie pose la question : Hi, my name is Mollie and I'm in 5th grade. Here's the math problem I have for homework tonight:
"Larissa made a model of a polyhedron using 8 pieces of clay for the vertices and 18 straws for the edges. What type of
polyhedron did Larissa make?"
Thanks. Penny Nom lui répond. 





The dimensions of a pool 
20090118 

denise pose la question : a rectangular swimming pool is three times as long as it is wide. if the perimeter of the pool is 320 feet, what are its dimensions Penny Nom lui répond. 





Nickels, dimes and quarters 
20081027 

val pose la question : I would like help working out a math word problem. A collection of 30 coins worth $5.50 consists of nickels, dimes, and quarters. There are twice as many dimes as nickels. How many quarters. Could you teach me how to find this formula? Penny Nom lui répond. 





The length of a rectangle is 6 inches less than 3 times its width. 
20081026 

Angela pose la question : The length of a rectangle is 6 inches less than 3 times its width. Find the
dimensions of the rectangle if its area is 45 square inches. Penny Nom lui répond. 





The dimensions of a rectangle 
20081016 

cristine pose la question : the area of a rectangle is 675sq.cm.
if the width is 1/3 of the length.
find the dimensions of the rectangle.... Penny Nom lui répond. 





The dimensions of a pool 
20081008 

Justine pose la question : This may be a really silly question but I am trying to work out what the possible dimension a pool may be if we have 20m length of wall of an above ground pool (laid out flat on ground)
We have been given a second hand above ground pool and we know it was in an oval configuration and we are just trying to get a guesstimate of the potential size it may be as the people couldn't tell us the size Penny Nom lui répond. 





The length of a tank 
20081001 

alex pose la question : I have a tank which I can only partly see. It is 70cms wide, 45 cm deep and hold 500litres. How long is it? Harley Weston lui répond. 





24 in by 14 in by 14 in in cubic feet 
20080805 

Tom pose la question : I have a box that has internal dimensions of: 24in. H x 14in. W x 14in. D.
How many cubic feet is this internal space? Penny Nom and Victoria West lui répond. 





Concrete blocks 
20080618 

marvin pose la question : How many cement blocks do i need to build a 8 ft. tall wall x 1,300 ft. long? Harley Weston lui répond. 





What are the dimensions of the rectangle? 
20080611 

Denise pose la question : A rectangle has a diagonal that is 3.6 feet longer than the length and 7.1 feet longer than the width. What are the dimensions of the rectangle? Claude Tardif and Victoria West lui répond. 





Double the the dimensions of a rectangle 
20080522 

Destiny pose la question : Double the the dimensions of a rectangle that is 3 by 4 in. What is the area? Penny Nom lui répond. 





Fencing around a playground 
20080515 

Vanessa pose la question : If the playground is a rectangle with it's width 10ft shorter than it's length,
and it can be enclosed by exactly 140ft of fence,
what is the length and width of the playground? Penny Nom lui répond. 





The dimensions of a rectangle 
20080306 

Julie pose la question : Find the dimensions of a rectangle with an area of 400. Width x ft.
Length (2x7)ft. Stephen La Rocque and Penny Nom lui répond. 





The dimensions of a rectangle 
20080201 

Evan pose la question : you are given that the area of a rectangle is 21.6in sq. find the base and the height of the rectangle. Penny Nom lui répond. 





What size room would I need for 220 cubic feet? 
20071218 

Andy pose la question : What size room would I need for 220 cubic feet? What is the calculation I would use to find the answer to this problem? Penny Nom lui répond. 





The dimensions of a box 
20071130 

nephi pose la question : if i wanted to make a box that was 0.35 ~ 0.7 Cubic Feet on the inside how would i go about making the measurements for the outside? Penny Nom lui répond. 





The width of a property 
20071129 

Angie pose la question : I need to know what the footage is to find 8.1 acres knowing that the North boundary is 1309' Penny Nom lui répond. 





Changing units and sizes of things 
20071108 

Carol pose la question : volume of cube = 216 cubic inches how do I calculate cubic feet and calculate its surface area in square feet.
a rectangular box has dimensions of 3 x 6 x 15 how do I calculate surface area in square yards and calculate volume in cubic inches. if I double the dimensions how does it affect the volume Stephen La Rocque lui répond. 





Chris has twice as many $1 bills as pennies 
20071102 

vicky pose la question : Chris has twice as many $1 bills as pennies, twice as many dimes as he has $10 bills, and twice as many pennies as he has dimes. How much money does he have? Penny Nom lui répond. 





A wiffleball field 
20071031 

Svitlana pose la question : The Adam's family has set up a wiffleball field in their backyard. The bases are arranged like a typical baseball diamond, where the distance between consecutive bases is the same. First base is opposite of third base, and second base is opposite of home plate. The distance between consecutive bases is 50 feet. Now, the pitcher stands 25 feet from home plate and lies on the line between home plate and second base. How far is the pitcher from first base? Round your answer down to the nearest inch. Penny Nom lui répond. 





The length of a rectangle is twice the width 
20071026 

Tami pose la question : The length of a rectangle is twice the width. The number of square units in it's arear is four times the number of units in it's perimeter. What are the dimensions of the rectangle? Penny Nom lui répond. 





Calculate the dimensions of the rectangle 
20071016 

Sara pose la question : The perimeter of a rectangle is 62cm. The length of the diagonal is 25 cm. Calculate the dimensions of the rectangle. Stephen La Rocque lui répond. 





The dimensions of a rectangle 
20071014 

Elizabeth pose la question : The perimeter of a rectangle is 20m. The area is 20sqm. Calculate the dimensions of the rectangle. Give your answers correct to two decimal places. Penny Nom lui répond. 





Making a box with a particular volume 
20070620 

Kimberly pose la question : How do you convert 487 cf into box? Stephen La Rocque lui répond. 





A speaker box 
20070505 

darell pose la question : I am trying to build a speaker box, and i am trying to find out the measurements of a 1.5cubic feet box. Penny Nom lui répond. 





By how many feet was each dimension increased? 
20070418 

Becca pose la question : A rectangle is 8 feet long and 6 feet wide. If each dimension is increased by the same number of feet, the area off the new rectangle formed is 32 square feet more than the area of the original rectangle. By how many feet was each dimension increased? I need a diagram and 5 or more sentences for an explanation. Thanks! Stephen La Rocque lui répond. 





Cut a cake into four pieces 
20070327 

haley pose la question : A cake measures 10 inches x 10 inches. The cake was cut into 4 pieces that were the same size. What could the size be of each piece? Penny Nom lui répond. 





Nickels, dimes and quarters 
20070318 

Alexandra pose la question : Ellen has two more nickels than dimes and three more quarters than nickels. She has $3.35 in all. How many coins of each type does she have? Penny Nom lui répond. 





Nickels, dimes and quarters 
20070205 

Avinash pose la question : Mary has 48 coins made up of nickels, dimes and quarters with a total value of $5.10. She has 4 more dimes than nickels and quarters combined. How many coins of each kind does she have? Use matrix to solve the system Stephen La Rocque lui répond. 





Drilling holes in a cube 
20061212 

Liz pose la question : What is the volume of the solid remaining if a unit cube has a hole drilled thru one face to the opposite side and the hole that is drilled is a cylinder of unit diameter. Then the cube is rotated and an identical hole is drilled from an untouched face to the opposite side. Then the cube is rotated and an identical hole is drilled between the last two untouched faces. This will result in the cube vertices and the remaining volume of the cube falling into 8 parts. What is the total volume of these 8 parts. How is this volume calculated? Penny Nom lui répond. 





Dimensions of a rectangle 
20061122 

Terri pose la question : How can you find the dimensions of a rectangle that has a perimeter of 18 feet? Stephen La Rocque lui répond. 





Bill has four more dimes than nickels ... 
20061105 

Allison pose la question : bill has four more dimes than nickels, and seven fewer nickels than pennies.he has a total of $3.35. how many of each kind of coin has he? Karen McIver lui répond. 





The dimensions of a rectangle 
20061102 

Ben pose la question : A rectangle's length is 8 cm. greater than its width. Its perimeter is 128 cm. Find its dimensions. Penny Nom lui répond. 





Word problem 
20061022 

Sabrina pose la question : Thomas bought a badminton racquet and paid for it in quarters. If Thomas had used nickels and dimes, he would have needed 20 more dimes than quarters and one more than twice as many nickels as quarters. How much much did the badminton racquet cost? Stephen La Rocque lui répond. 





The dimensions of a rectangle 
20060709 

Lori pose la question : The length of a rectangle is 1 cm more than 3 times its width. If the area of the rectangle is 61 cm2, find the dimensions of the rectangle to the nearest thousandth. Penny Nom lui répond. 





A 52 cubic foot box 
20060614 

Konstanze pose la question : I need to figure out what LXHXW I need to create a 1.5 cubic meter or 52 cubic foot volumethere is an answer in your database that relates to this..but it does not give the formula to go from cubic feet/inches to a measurement for a box.
Empirically I can figure out that 3 x 3 x 3 equals 27 and that 3.5 feet (42") x 3.5 x 3.5 equals 42.87 and 3.75 x 3.75 x 3.75 equals 52.73 which is about 1.5 cubic meters (1cubic meter = 52.971643 cubic feet) i.e a box 45 x 45x 45 "
There must be an easier way. Penny Nom lui répond. 





What are the dimensions of the field? 
20060514 

Angie pose la question : The length of fence required to enclose a rectangular field is 3000 metres. What are the dimensions of the field if it is known that the difference between the length and width is 50 metres? Penny Nom lui répond. 





The centre and radius of a circle 
20060402 

Kaye pose la question : I need to calculate Dimension E and F. I am given A, B, C, (or over all A+B+C), D, G. The radius is one continuous unknown radius.
Example: A = 23.50
B = 35.50
C = 0.50
D = 11.50
G = 23.50
I have calculated this for angles but my mind is drawing a blank for the radius calculation. I can draw it but I need to put into Excel spreadsheet.
Harley Weston lui répond. 





A 3dimensional star 
20060315 

Rachel pose la question : I am trying to figure out the name of a figure that consists of 8 (I think) square pyramids. There is a net drawing of this figure somewhere and I can't find it because I don't know the name. When all 8 pyramids are connected, they form a '3dimensional star'. We did this project when I was 14 years old and I am now a 27 year old teacher and I would love to do this project with my kids.
chris Fisher lui répond. 





On the blueprint, the scale indicates that 2 cm represents 5 ft. 
20060311 

Teresa pose la question : On the blueprint, the scale indicates that 2 cm represents 5 ft. What are the actual dimensions of a room that is 4.8 cm by 6 cm on the blueprint? Penny Nom lui répond. 





The dimensions of a poster 
20060308 

Sonu pose la question : poster measures 150cm by 180cm is enlarged in the ratio 8:5 find the length and breath of the enlarged poster. Stephen La Rocque lui répond. 





The dimensions of a box 
20060223 

Ben pose la question : I need to find the dimensions of a rectangular box. They ask for the areas of the top, side and end. If those areas are 120 square units, 96 square units, and 80 square units respectively, what are the dimensions of the box? Stephen La Rocque lui répond. 





A 6ft hexagon around a tree 
20050920 

Ray pose la question : I am trying to build a 6ft hexagon around a tree in my front yard. I have asked everyone how do I figure the size of each side. I now have several calculations and many theories but still do not know how much lumber and at what angel to cut and what length. I am simply a senior citizen just trying to create something different in my yard. Harley Weston lui répond. 





A 3dimensional pie shape 
20050917 

Bill pose la question : Your site appeared in my search for the name of a 3dimensional pie shape. 2d would be a sector of a circle. As it it curved, I don't believe it is in a the polyhedra family. Can you help me find the mathematical term for it? Chris Fisher lui répond. 





Dimensions of a roof 
20050318 

A roofer? pose la question : A right triangle (roof of a house) has a base of 7 feet and a 22 degree angle. What is the height of the roof and what is the hypothenus of the triangle. Penny Nom lui répond. 





Th dimensions of a garden 
20050209 

Rebecca pose la question : Nate's garden has a perimeter of 34 meters and an area of 72 square meters. What are the dimensions of the garden? Penny Nom lui répond. 





Acres 
20050108 

Jim pose la question : What size is this lot?
And is there a location on the web where you can plug in lot dimensions to figure acreage?
North = 180ft
South = 210ft
West = 336ft
East = 244 ft Harley Weston lui répond. 





An Octagon 
20041010 

A parent pose la question : I am trying to determine what the size of each triangle is of a 12 foot circle consisting of 8 triangles would be. I've gotten as far as the radius being 6 feet, but cannot figure the distance. Penny Nom lui répond. 





The dimsenions of a room 
20040518 

Estella pose la question : I have a room that is rectangular the area is 159.5 feet, the perimeter is 51 feet what would the dimensions of the room. Penny Nom lui répond. 





The dimensions of a rectangle 
20040221 

Jane pose la question : A rectangular label has an area of 176cm2 and a perimeter of 54cm. Find the dimensions of the label. Penny Nom lui répond. 





The square footage of a section of land 
20030604 

Diane pose la question : We are trying to calculate the square footage of a section of land with the following dimensions:
One end is 100 feet. The other end is 105 feet.. One side is 350 feet and the other side is 372 feet. I calculated the area as 35,875 sq. feet, however, the brochure for the land says the area is 36,200 + sq. feet. Leeanne Boehm lui répond. 





A penny, a nickel, a dime, a quarter, and a loonie 
20030121 

Blaine pose la question : I have 5 coins: a penny, a nickel, a dime, a quarter, and a loonie. How many different amounts of money could I pay using any combination of these coins? Penny Nom lui répond. 





The dimensions of a box 
20021203 

Paula pose la question : My son, who is in secondary school, needs to make a box with the inside dimensions of 1.25 cubic feet. It's supposed to be more in the shape of a rectangle than a square. I would like to know the equation to use to find the inside dimensions of a box if I know how many cubic feet (or inches) I need the inside to be. Penny Nom lui répond. 





Pythagoras in three dimensions 
20021014 

Miki pose la question : A room is 6m long, 5m wide and 3 m high. Find the distance from the corner of the floor to the opposite corner of the celing. Peny Nom lui répond. 





Distance in 3space 
20020816 

David pose la question : The question is: how do I figure out the distance of one object in 3D space to another object in 3D space? I have an object at say x = 5.872, y = 2.876, and z = 7.290; and the other object is at x = 1.129, y = 8.213, and z = 11.127. I have been suggested to use the pythagorean theory on this, but since there are three variables, I don't understand how. Penny Nom lui répond. 





Nickles, dimes, quarters and fifty cent pieces 
20020108 

A parent pose la question : The total for all coins counted is $4,564.50 The last coin added to the pile is a 50 cent piece There are 8 times as many 50 cent pieces as there are quarters There are 6 times as many dimes as nickles How many of each are there? Penny Nom lui répond. 





A 3 dimensional 5 pointed star 
20011108 

Kent pose la question : I am looking for a formula that will give me a layout for a 3 dimensional 5 pointed star. I want to form it out of sheet metal, using 5 polygons and soldering them at the apex. Can you please help me with this? I would like to be able to give the formula the height of the star from the bottom two points to the top point and also how deep the star is. Thank you very much! Judi McDonald lui répond. 





A line in 3 dimensions 
20011017 

Murray pose la question : I'm working on a complicated proof and i need the equation for a line in 3 dimensions. Claude Tardif lui répond. 





Dimensions of a frame 
20011016 

Rachel pose la question : A rectangular picture frame has a perimiter of 44.2 cm.The width of the frame is seven tenths of its length what are the dimensions of the frame? Penny Nom lui répond. 





Securing a plank in four dimensions 
20010606 

Becca pose la question : If it takes two nails to secure a plank from rotating on a wall in the third spatial dimension, how many nails would it take if you were attempting to secure the board from rotating in the fourth spatial dimension? Walter Whiteley lui répond. 





Toy bricks 
20010513 

Sarah pose la question : A regularsized brick weighs 4 kilograms. How much will a similar toy brick, made of the same material, but all of the same dimensions of which are four times smaller, weigh? The 300metre tall Eiffel tower is made of steel and weighs 8 000 000 kg. An exact replica, made of the same material, weighs 1 kg. How high is the replica Penny Nom lui répond. 





A box with an interior of 1.25 cubic feet 
20010326 

Gabe pose la question : I need a box with an interior of 1.25 cubic feet. I am using 3/4 inch material to make the box. What would the exterior dimensions be in inches? Harley Weston lui répond. 





A four dimensional object 
20010214 

A student pose la question : Can you give me some examples of a four dimensional object you can find around your house? Harley Weston lui répond. 





Rotation 
20010125 

A student pose la question : If I have a rectangle 2inches long and 4 inches wide and I rotate the rectangle 45 degrees will the length still be 2 inches? Penny Nom lui répond. 





A dollar, quarter, dime, nickle and penny 
20010107 

Sarah pose la question : Arnold has a dollar coin, one dime, one quarter, one nickel, and a penny. The number of different sums of money that can be formed using three coins is... Penny Nom lui répond. 





Find the 3D angle 
20001118 

Jacky pose la question : Included is the diagram. I am trying to find out the angle of ABC. Is it possible? How? Penny Nom lui répond. 





Crown molding mitre cuts 
20001106 

Jim Tomfohrde pose la question : My question has to do with making mitre cuts when installing crown molding. Crown molding is the trim that is put up at the top of walls with one edge on the wall and the other edge on the ceiling. To make a mitre cut on your mitre saw for a 90degree corner you can lay the molding flat on the saw base, set the bevel of the blade to 34 degrees and the mitre to 31.5 degrees (these may be slightly appoximate). Of course depending on which piece of molding you're cutting you will cut one end or the other, or use the left or right end. These angles allow the cuts to line up and form a seamless corner when they're put in place on the wall/ceiling at 90 degrees. My question is this  is there some mathematical formula from which the 34 degrees and 31.5 degrees are derived. I want to know this because in many cases the corner is not 90 degrees but can be more or less, and in these instances I would like to know if I can calculate the bevel and mitre to use based on the angle of the corner. Harley Weston lui répond. 





Is a sheet of paper 2dimensional? 
20000306 

Jaclyn Evans pose la question : One day, we were discussing 3dimensional items. Is a sheet of paper considered a 3dimensional shape? Or is it 2dimensional as described by 8.5 by 11 size? Also, could you give me an example of a 4dimensional item or scenario? Harley Weston lui répond. 





Three dimensional rectangle 
20000111 

Dennis Murphy pose la question : I would like to find out the name of a Three dimensional rectangle. Harley Weston lui répond. 





Measuring the fourth dimension 
19990607 

Suzanne Hall pose la question : Hi! The other day, two of my students asked a very interesting question: Is the fourth dimension measured with hypercubes? Their reasoning went like this: Lines are 1D and are measured with line segments, which are part of a line. Planes are 2D and are measured with squares, which are part of a plane. Space is 3D and is measured with cubes, which are part of space. So, logically, hypercubes would be used to measure the fourth dimension. Chris Fisher lui répond. 





Dotted graph paper 
19990408 

Bridget Winward pose la question : A teacher at our school is trying to locate dotted graph paper online or in print. His class would like to make three dimensional, geometerical drawings. Please let us know if you have a good source. Jack LeSage lui répond. 





Cubic feet and gallons 
19990326 

Karen Coheley pose la question : How many gallons in a cubic ft. ?? Harley Weston lui répond. 





Intersection of planes 
19981122 

Dave Rasmussen pose la question : I am a teacher of secondary mathematics with a question about the uses of Three Dimensional Coordinate Geometry. I have been teaching my students to write equations of planes and lines,  to find the intersection of these and the distance between them. What I am having difficulty finding are good applications of these techniques to "real world" situations. Can anybody help me? Walter Whiteley and Harley Weston lui répond. 





The Fourth Dimension 
19980524 

Whitney Page pose la question : Okay, here goes all my effort to try to explain shat I'm trying to ask of you. It's about something I read in a book called A WRINKLE IN TIME, by Madeline L'Engle. It's called tesser, or tesseract. It talks about first diminsion, a straight line, second diminsion, a flat square, and third diminsion, a square with sides, front and back, top and bottom. I can picture all of that. Then it says that fourth diminsion is when you square the three diminsional square. It also described the fourth diminsion as time. I can't figure out how that can be. Then it says... Chris Fisher lui répond. 

