







Finding the area of a regular polygon 
20070504 

Dana pose la question : We are trying to figure the square footage of a tetradecagon....sort of a round house with 14 sides that are 8 ft' in length. It has a height of 9 ft. How do we figure the square footage of this? Stephen La Rocque lui répond. 





What do you call a 43sided polygon? 
20200106 

Alniko pose la question : What do you call a 43sided polygon and what is its interior angle's total measure? Penny Nom lui répond. 





Internal acute angles 
20190402 

karan pose la question : Prove that a convex polygon cannot have more than three acute internal
angles. Penny Nom lui répond. 





A circle inscribed in a regular polygon 
20180712 

Naveen pose la question : The radius of inscribed circle for n sided regular polygon of a side a is?
Please with proof Penny Nom lui répond. 





A polygon inscribed in a circle 
20170527 

Levan pose la question : This was the closest to what I am trying to solve.
http://mathcentral.uregina.ca/QQ/database/QQ.09.06/s/dj1.html
So in the answer linked, we figure out what is "c".
But what if we know "c" and want to find out "n" based on specific "r=1".
It might be simple math, but I have not had any relationship with math for 20 years now
but this question puzzles me for a reason. Penny Nom lui répond. 





The number of sides of a polygon 
20160723 

Shriya pose la question : All the angles of a polygon are either 155° or 140°.
There are twice as many angles of 155 °or 140°.
Find the number of sides of the polygon Penny Nom lui répond. 





External and interior angles of a regular polygon 
20160419 

pearl pose la question : a polygon has n sides.The exterior angle is 8 times the interior angle
find the value of the interior angle
find the value of n Penny Nom lui répond. 





The interior and external angles of a regular polygon 
20160217 

percy pose la question : a regular polygon has n sides .The size of each interior angle is eight times the size of each exterior angle .
1.find the size of each exterior angle
2.calculate the value of n Penny Nom lui répond. 





The diagonals of a polygon 
20160129 

Sofia pose la question : What are diagonals and if you drew an octagon and drew all the diagonals how many would there be? Please explain because this is pretty confusing! Thank you! Harley Weston lui répond. 





Intersection points and diagonals 
20130911 

Kenneth pose la question : I was wondering, is there a relationship between the number of sides of a regular ngon and the number of times its diagonals intersect?
Ie:
4 sides=1 intersect (center, diagonals form an 'X' )
5 sides=5 intersects (diagonals form a star)
6 sides=13 intersects
And so on. Chris Fisher lui répond. 





The fourth side of an irregular polygon 
20130201 

Emran pose la question : I have a irregular polygon. I know 3 of the 4 sides, and 2 of the angles. AB is 285, BC is 149, and CD is 310. Angle B is 135 degrees. and Angle C is 45 degrees. Is there a formula to solve for the final side? Thanks. Penny Nom lui répond. 





A stained glass lamp 
20110725 

Guy pose la question : Like Kay, I also work in stained glass, but in 3dimensions. I am
frequently asked to replicate lamp shades in stained glass where the
diameter of the top is different (narrower) from the diameter of the
bottom (which is wider). Some people want 5, 6, 7, 8, 10, 12, 16, ,,,
nsided shades. Is there a formula I can use to determine the width
of the sides using the angle, if I remember correctly, I think it's
called theta. In other words, is there a formula where I can plug
in the angle which describes the arc of the circle. For instance, if
someone asks for a 7 sided shade, plugging in 51.43 (360/7). I
could then use that to determine the width at the top and bottom
rings to create the appropriate trapezoids. I've visited a few sites
so the formula looks like its a function of sin & cos but they are
presented like proofs for teaching. Your site appears to want to
actually answer questions without making the inquirer feel stupid. Harley Weston lui répond. 





Dividing a polygon into triangles 
20110416 

Foxie pose la question : You have a given regular polygon with n vertices and you divide it into triangles(using the vertices of the polygon) which each share at least one side with the polygon. How many distinct ways can you divide the polygon if its vertices are numbered? For n=3 it's 1 way, for n=4 it's 2 ways for n=5 5 ways, I'm not quite sure but think that for n=6 it's 12 ways... thanks in advance! Claude Tardif lui répond. 





Regular and irregular polygons 
20110310 

thaera pose la question : the difference between regular shape and irregular shapes. Penny Nom lui répond. 





The interior angles of a pentagon 
20110310 

Daima pose la question : I need help!
The interior angle of a pentagon i s5 ( I hope ) or 540 degrees.
The interior angle of a pentagon is what? Explain to me please.
Daima Penny Nom lui répond. 





Vertices and sides of a polygon 
20110304 

RINA pose la question : My questions is : would a vertices and sides of a polygon be the same number. For example, a octagon it has 8 points and 8 sides. Am i correct? Robert Dawson lui répond. 





Sides and diagonals of a polygon 
20101125 

nicky pose la question : The sum of sides of two polygons is 12 and the sum of their diagonals is 19. What kind of polygon are they? Penny Nom lui répond. 





Intersecting polygons 
20101117 

Laura pose la question : How can I estimate the amount of intersection (area or better a normalized number) between two polygons if I have the cartesian coordinates of their vertices?
Thank you in advance,
regards,
Laura Robert Dawson lui répond. 





A spaceship playhouse 
20100726 

Dave pose la question : I would like to build a spaceship playhouse for my grandson I want it to
be about 36" around and I want to use 5/4 decking boards that measure
5 1/2" wide how do I figure out how to lay out a base pattern to nail to
(what angle do I need to cut and how many boards will it take to go around
the circle. Penny Nom lui répond. 





Polyhedra and polygons 
20100426 

Brandon pose la question : What is the difference between a polyhedra and a polygon? Penny Nom lui répond. 





The area of a polygon 
20100328 

John pose la question : Question from John, a student:
How do you find the area of a polygon with any given amount of sides? Harley Weston lui répond. 





Polygons, diagonals and the sum of the measures of the angles 
20091218 

jason pose la question : find the set of polygons in which the number of diagonals is greater than the sum of the measures of the angles Robert Dawson lui répond. 





The maximum number of right angles in a polygon 
20091005 

Bruce pose la question : Is there way other than by trial and error drawing to determine the maximum number of right angles in a polygon? Secondary question would be maximum number of right angles in a CONVEX polygon. Is there a mathematical way to look at this for both convex and concave polygons? Or are we limited to trial and error drawing? Chris Fisher lui répond. 





An area problem 
20090830 

Amber pose la question : Area of hexagon ABCDEF with the vertices (3,0) (7,0) (9,2) (7,4) (3,4) (1,0) Harley Weston lui répond. 





4 tan(360/(2n)) 
20090518 

molly pose la question : in the formula to find the area of any regular polygon how do you figure out 4tan part of the formula Penny Nom lui répond. 





A shape with 10 sides 
20090303 

Sandra pose la question : One of my son's math questions is as follows:
Suppose I have a shape with 10 sides. I choose a vertex then draw lines to the other vertices that dont share sides with the first vertex. How many vertices will that be and why? Penny Nom lui répond. 





Diagonals of a polygon 
20090216 

Julie pose la question : How many diagonals can be drawn from one vertex in a 12sided polygon? Leeanne Boehm lui répond. 





The sides of a polygonal building 
20090213 

mark pose la question : length of sides of an 18 ft.diameter bldg
i need to find out if i should build an octagon or decagon to keep the
sides of the bldg at 8ft or less. how do i figure the length of the sides
of each? Penny Nom lui répond. 





Polygons with two names 
20081024 

Connor pose la question : Why do some polygons have two names and what are they?. Thanks Harley Weston lui répond. 





I have 6 vertices and 10 edges 
20081020 

Jacquelin pose la question : I have 6 vertices and 10 edges. One of my faces is a regular polygon. Chris Fisher lui répond. 





Irregular polygon and Circle that Intersects All Sides 
20080820 

Xetro pose la question : Hi,
Suppose you have an irregular polygon(convex or concave) with n > 3 sides.
The question is  Find some circle that will cut(in limiting case  touch) all the sides of that polygon.
It doesnt matter how many times it cuts the side(1 or 2), it just have to cut or touch it.
How to find such a circle? or how to decide if such circle even exists?
What if those segments do not form a polygon but are some arbitrary segments ?
Really want to know how to do it................
Thanks a lot..
Regards,
Xetro Janice Cotcher lui répond. 





Joining vertices in a polygon 
20080818 

Megan pose la question : I'm trying to develop a relationship between the number of points of a regular polygon and the
(a) number of lines you could draw between those points,
(b) number of triangles you could draw,
(c) number of quadrilaterals,
etc. Penny Nom lui répond. 





The exterior angles of a polygon 
20080626 

evelina pose la question : how many sides has a regular polygon if the measures of the exterior angle is given Walter Whiteley lui répond. 





The interior angles of an 18sided polygon 
20080604 

Alfred pose la question : How do I find the sum of the interior angles of an 18sided polygon? Janice Cotcher lui répond. 





How many bricks I can place around a 26inch circle? 
20080522 

Jon pose la question : I want to know how many bricks I can place around a 26inch circle? There must be a formula other than trial and error. The length of the bricks is 6inches. [How many 6inch tangents can be in a 26inch circle?
Thank you very much.
Jon Harley Weston lui répond. 





Naming a figure 
20080424 

P. pose la question : What is the name of a figure that has 2 sides that measure
25 feet each and 2 sides that measure 10 feet each? Penny Nom lui répond. 





Some 4 sided polygons 
20080411 

kathy pose la question : I am a 4th grade student and need to complete this question:
I need to draw 2 polygons with 4 sides and 2 right angles. Please help. Thanks Penny Nom lui répond. 





A regular polygon 
20080409 

chase pose la question : name the regular polygon if the sum of the measures of the polygon is 1,440 and the measure of one angle is 144 Stephen La Rocque lui répond. 





Any regular polygon inscribed in a circle 
20080317 

lindsay pose la question : how do find the perimeter of a regular octagon inscribed in a circle with a radius of 5 units Stephen La Rocque lui répond. 





A regular polygon 
20080122 

Andy pose la question : Hi. i am looking for an equation to find the radius of any given regular polygon, knowing the length of one of it's sides and how many sides it has..
for instance. A pentagon with 10 unit side , a hexagon with a 10 unit side, a septagon with a 10 unit side or tougher still a triangle wit a 10 unit side.
I am mathematically challenged so please try to keep it in layman's terms.
Basically im looking to array rectangles, inside corner to inside corner around a common center. The rectangle's widths change but are always equal/ uniform among one array.
Im not looking for the answer but am looking for the formula.
Thanx in advance,
Andy Stephen La Rocque lui répond. 





The centroid of a polygon 
20071229 

David pose la question : I am playing around with an idea. I've read previous answers to questions
(using surveyor calculation methods) related to finding the area of an irregular
shape parcel of land (or irregular polygon). Is there a formula or method for
calculating the centroid (midpoint) for this type of polygon. I've seen plenty
of methods for calculating the midpoint for a triangle or regular shape poloygon
but few for an irregular shape polygon such as a parcel of land. Thanks... Harley Weston lui répond. 





Polygons 
20071209 

Nicholle pose la question : a polygon with all sides the same length and all angles the same measure is called a  polygon.
What word goes in the blank. Penny Nom lui répond. 





Area of a 17sided lot 
20071121 

Lynda pose la question : My uncle is wanting to buy this piece of land [a 17sided polygon] but we are questioning the acerage total. the measurements are [on the attached diagram]. Stephen La Rocque lui répond. 





Name the polygon 
20071115 

Austin pose la question : My son has a math question that I'm trying to help him with. The question states name the polygon. Then name the vertices. I believe its a trapezoid. Each vertex has a letter and I'm not sure what the teacher is really asking for? Penny Nom lui répond. 





Working with x 
20071012 

Robert pose la question : The question: The measure of an exterior angle of a regular polygon is given. Find the measure of an interior angle, and find the sides.
41. 36 42. 18 44. 'X'
The attachment has what she has done for 41 and 42. Need help with 44 (lots of help) Thank you in advance for your site and your help. Robert Penny Nom lui répond. 





The angles in a polygon 
20071011 

Farzan pose la question : Prove with induction that in a polygon( that may not be convex )
with n sides, the sum of the amounts of the angles become 180(n2).
If there is any easier methods to prove the problem, please write as well. Stephen La Rocque lui répond. 





The perimeter of a regular polygon 
20070918 

Ashwynn pose la question : why does the area of regular polygons with a perimeter of 1000m increase as the number of sides increase? Stephen La Rocque lui répond. 





Triangles, squares and pentagons? 
20070904 

Malea pose la question : How do you find the nth term in a set of triangles, squares and pentagons? Harley Weston lui répond. 





How many diagonals does a polygon have? 
20070718 

Edna pose la question : how do you find the numbers of diagonals of a polygons? Stephen La Rocque lui répond. 





Any regular polygon inscribed in a circle 
20070712 

DJ pose la question : Circle with r=12" is inscribed in a regular octagon. What is the length of each octagon segment?
Note: Our answer works for any regular polygon inscribed in any circle. Stephen La Rocque lui répond. 





The area of an irregular polygon 
20070627 

chris pose la question : finding square footage of a polygon with unequal measurements Stephen La Rocque and Harley Weston lui répond. 





A circle and polygon with equal perimeters 
20070605 

matthew pose la question : Why does a circle have the largest area of any polygon when the perimeter is always 1000m for every polygon? Stephen La Rocque and Penny Nom lui répond. 





Discovering the incircle of an irregular polygon 
20070525 

Joaquim pose la question : I've been searching in some books and many websites, but I couldn't find a formula or algorithm for discovering the incircle of an irregular polygon, could you please help me? Walter Whiteley lui répond. 





Areas of polygons 
20070520 

kendra pose la question : i have questions on how to find the area of pentagons, hexagons, and nonagons.
i was asked to find the area of all of them and they gave me either the length of one side or the perimeter. Stephen La Rocque lui répond. 





Lot size / acreage (more than three sides) 
20070511 

Martha pose la question : What is the lot size of the following dimensions equivalent to acre.
141.85 x 52.55 x 217.63 x 38.89 x 68.08 Penny Nom and Stephen La Rocque lui répond. 





How can I find out how many sides there are? 
20070423 

gn pose la question : I know the angle measurements of a convex polygon. They are congruent angles. How can I find out how many sides there are? Steve La Rocque, Penny Nom and Walter Whiteley lui répond. 





A 13 sided figure 
20070412 

Kiara pose la question : I was wondering what you call a 13 sided figure. I'm in
6th grade and my teacher said i could get extra credit if I figure this out. Thanks
a lot for your help.When I get extra credit I will be sure to mention you guys!
Thanks! Stephen La Rocque lui répond. 





Interior and exterior angles 
20070402 

Anuj pose la question : If in a regular polygon, each exterior angle is twice the interior angle,find the number of sides? Leeanne Boehm lui répond. 





An irregular polygon 
20070306 

Dike pose la question : How do i construct an irregular polygon Penny Nom lui répond. 





The area of an Lshaped polygon 
20070223 

Louanne pose la question : How do I find the surface area of a L shaped polygon? Melanie Tyrer lui répond. 





What is the point of intersection of two sides of a polygon? 
20070123 

Tyler pose la question : What is the point of intersection of two sides of a polygon? Stephen La Rocque lui répond. 





Irregular multi sided polygon 
20070120 

Graham pose la question : I have an irregular polygon. I know the length of all the sides and know approximately all the internal angles. Is there a formula or table that can calculate the area for me? Steve La Rocque, Chris Fisher and Penny Nom lui répond. 





The area of an irregular pentagon 
20070118 

Ranjit pose la question : I would like to find the area of an irregular pentagon where the total perimeter is 1000m. Is there a Heron's formula for this? Stephen La Rocque lui répond. 





Can you characterize ALL polygons by the number of diagonals it has? 
20061217 

Katie pose la question : Can you characterize ALL polygons by the number of diagonals it has? Penny Nom lui répond. 





Circles and polygons 
20061211 

Irene pose la question : Can you define a circle as a polygon with an infinite number of sides which are infinitely small? If you can, can you then define a cylinder as a prism? The sides would be rectangles or parallelograms with one length infinitely small? Chris Fisher lui répond. 





The area of a 20 sided polygon 
20061202 

Kate pose la question : could you please tell me the strategy of how to work out the area of a 20 sided polygon Stephen La Rocque and Penny Nom lui répond. 





The area of a lot 
20060805 

Lyn pose la question : I have no idea how to find the square feet of an uneven polygon. I am in the process of making a land agreement and need to know.
Please tell me how to figure out the footage and acreage of land as follows.
roadfront 360'
back 360'
left side 220'
right side 180' Penny Nom lui répond. 





The chord length of a polygon 
20060614 

Krishna pose la question : I have to find out the chord length of a polygon  Tetradecagon ! The Radius of the Circle is 11.5 Cms. The Circle is intersepted by 14 arcs. Then how to find out the chord length? Stephen La Rocque lui répond. 





An irregular quadrilateral 
20060204 

Christopher pose la question : Is there such a shape as an irregular quadrilateral with 4 equal sides? Penny Nom lui répond. 





Subdividing a polygon into triangles 
20060126 

Adam pose la question : is there an algorithm to divide a regular polygon into N
equilateral triangles having the same area (no limit on N), or if not, an
algorithm to divide a regular polygon into N triangles having the same shape
and size? Chris Fisher lui répond. 





Interior and external angles of a polygon 
20060117 

Anthony pose la question :
In a regular polygon, the ratio of the interior angles to the exterior angles is 3:1.
(a) Find the measure of the interior angle.
(b) How many sides are there
Penny Nom lui répond. 





The area of a polygon 
20051231 

Rahul pose la question : I have problem in finding area of polygons. I don't know the formula to find area of pentagon, hexagon and so on. Penny Nom lui répond. 





A 24 sided polygon 
20051214 

Matt pose la question : I would like to know if there is a name for a 24 sided shape Penny Nom lui répond. 





Resizing a polygon 
20051126 

Anthony pose la question : I am currently working on a mapping program in which polygons, rectangles, circles, etc... are rotated, moved, and resized. Recently, I used the rotation conversion formula to rotate the items n degrees/radians by using the point and the center point of the shape.
Currently, I am working on resizing the shape (length and/or width) while still trying to maintain the integrity of the shape. I basically want to decrease or increase the y value by 1 in order to resize the length and I want to decrease or increase the x value by 1 in order to resize the width.
The corresponding x and y values either increase by 1, stay the same, or decrease by 1.
Is it possible to use just the point and center of the shape in order to calculate this resizing?
What can I use to accomplish this task? Chris Fisher lui répond. 





What is the sum of the measures of the angles of a decagon? 
20051015 

Dianna pose la question : What is the sum of the measures of the angles of a decagon? Penny Nom lui répond. 





Each interior angle of a particular polygon is an obtuse angle... 
20050222 

Victoria pose la question : Each interior angle of a particular polygon is an obtuse angle which is a whole number of degrees. What is the greatest number of sides the polygon could have? Walter Whiteley lui répond. 





A line segment connecting two vertices of a polygon 
20050202 

James pose la question : What is a line segment (not a side) connecting two vertices of a polygon called? Penny Nom lui répond. 





Interior and exterior angles of a polygon 
20041116 

Aaron pose la question : How do you find the measure of interior and exterior angles of a regular polygon when you are given the number of sides? Walter Whiteley lui répond. 





A fifteen sided polygon 
20040305 

Joann pose la question : WHAT IS THE NAME OF A FIFTEEN SIDED SHAPE? Penny Nom lui répond. 





Nonconvex shapes 
20040218 

Merrill pose la question : Draw 4, 6 and 8 sided shapes so that ONE straight line can be drawn through each side Chris Fisher and Penny Nom lui répond. 





The angles in a regular polygon 
20031221 

Ernie pose la question : If i have a measure of one interior angle of a polygon, how can i find the number of sides it has? Penny Nom lui répond. 





A circle around an irregular polygon 
20031103 

Dale pose la question : How do I find the properties of a circle that is drawn around an irregular polygon of (n) sides with the lenghts of each side given and all end points of the polygon lye on the circumferance of the circle? Chris Fisher lui répond. 





Diagonals in an octagon 
20030804 

Amanda pose la question : How many diagonals are in an octagon??? What would be a drawing of those diagonals??? Penny Nom lui répond. 





A regular polygon 
20030226 

Melissa pose la question : The measure of each interior angle of a regular polygon is eight times that of an exterior angle of the polygon. How many sides does the polygon have? Penny Nom lui répond. 





Constructions of polygons 
20030103 

Garrett pose la question : Our teacher just finished the constructions unit, and he mentioned briefly about odd sided figures such as pentagons and septagons, only that they're very hard. My question is, how do you draw, with a compass and a straight edge, a pentagon and septagon? Chris Fisher lui répond. 





A polygon inscribed within an ellipse  Part 2 
20020708 

Steven pose la question : I recently sought your advice about a problem that I have been working on for eight years or so concerning a polygon inscribed within an ellipse. I think that I may have confused matters by the way in which I put the question and hope that the enclosed diagram will clear matters up. In the ellipse below I have drawn three chords inscribed within one quadrant ( this would pertain to a twelve sided figure within the whole ellipse). These chords are exactly the same length as each other, for example if the major axis of the ellipse was 360 and the minor axis 240 I have worked out that a twelve sided figure would have sides of 78.2487. However I worked this out empirically with a method that could only be described as gruelling I would be most grateful if you could tell me of a method that would work for any ellipse and any number of sides. Chris Fisher lui répond. 





An equalateral polygon inscribed within an ellipse 
20020630 

Steven pose la question : How would you calculate the length of one of the sides of an equalateral polygon (of n sides) inscribed within an ellipse ( of any eccentricity ) where all of the vertices exactly touch the perimeter of the ellipse? I know that when the eccentricity is zero ( i.e a circle ) the formula: r * (sin(180/n) * 2) will suffice. But what about when the eccentricity is greater than zero? Chris Fisher lui répond. 





Diagonals in a polygon 
20020410 

Murray pose la question : If you have a regular polygon with n sides and you draw all (n3)n/2 diagonals how many intersection will they form with each other and how many sections will they devide the polygon into. Caude Tardif and Chris Fisher lui répond. 





The average of two polygons 
20011023 

Irene pose la question : How can I prove that the average of two polygons will give me another one? Walter Whiteley lui répond. 





A polygon with five sides 
20011003 

A student pose la question : I was asked a question in 5th grade today that goes: i am a polygon with five sides and 2 right angles what do i look like and what is my name Penny Nom lui répond. 





A polygon 
20010911 

Sueling pose la question : what is the smallest polygon. what is a polygon. Penny Nom lui répond. 





A 91gon 
20010910 

Ashley pose la question : Hi! My name is Ashley and I am an 8th grader and I couldn't find the name of a polygon with 91 sides. i was a question from my math teacher. Penny Nom lui répond. 





Area of a regular polygon 
20010501 

Carl pose la question : What is the formula for finding the area of a regular Hexagon and a regular Pentagon Penny Nom lui répond. 





Names of the polygons 
20010315 

Sami pose la question : I was asked to find out what the names for different polygons were. The only two I cannot find are the names for a polygon with 30 sides and a polygon with 40 sides. I would really appreciate it if you could help me. Thank you very much. Harley Weston lui répond. 





The bond angles of a tetrahedral polygon 
20010314 

Nishi pose la question : how do i prove (a simply as possible) why the bond angles of a tetrahedral polygon are 109.5 degrees? *i already have two explanations that i don't understand. one is about "theory of dot products" and "vectors" and a hooklike symbol w/ a cosine, and the other has an incomprhensible diagram w/ difficult notation PLEASE BE SIMPLE! thanks sooo much Harley Weston lui répond. 





What is my name? 
20010223 

Julia pose la question : My perimeter is 12 cm. My sides are all equal. The sum of half my sides is equal to 6 cm. How many sides do I have? What is my name? Penny Nom lui répond. 





Undecagon 
20010221 

Karen pose la question : I need to know what kind of a polygon an undecagon is and how many sides it has. This is a problem in my math book. Penny Nom and Michael Tsatsomeros lui répond. 





The area of platts 
20010220 

Steve pose la question : I have to calculate the areas of different "platts" of land from a map, and the only thing I have are the four side measures. There are some cases where no sides are parallel, no lengths the same, and no angles are given, and I was wondering how to calculate the area of such figures. I've attached a rough sketch of a typical platt's shape. Walter Whiteley lui répond. 





Angles in a polygon 
20010217 

Joan pose la question : How many sides does a polygon have if its smallest interior angle is 120 degrees and each sucessive angle is 5 degrees greater than the predecessor? Penny Nom lui répond. 





An irregular polygon 
20010209 

Jason pose la question : I have a 5 sided irregular polygon I am trying to figure out the area of. There are no right angles in the polygon as far as I can tell. I do not know any angles. Chris Fisher lui répond. 





The sum of the angles in a polygon 
20010123 

A student pose la question : What is the sum of the measures (interior angles) in an octagon ... heptagon ... decagon. Penny Nom lui répond. 





Area of shapes 
20001014 

Melanie pose la question : What is the formula to calculate the area of different shapes? Harley Weston lui répond. 





Hendecagon 
20001009 

Jillian pose la question : I need an example of a object that is in the shape of a hendecagon. I know what the shape is but I cannot come up with a real life example of an object that is this shape. Chris Fisher lui répond. 





A 100gon 
20000524 

Chris Mohr pose la question : What is a 100gon called? Harley Weston lui répond. 





Names of the polygons 
20000129 

Janemath pose la question : I have been doing research on the names of polygons with 11 to 20 sides. I have found conflicting names for some of them . for example 18 sidedoctadecagon and octokaidecagon. 11sidedundecagon and hendecagon. Why is this? Is one more correct than another? Or are they equally acceptable? Harley Weston lui répond. 





Two 12sided polygons 
19990925 

Kelly Boulton pose la question : Two 12sided polygons are similar. A side of the larger polygon is 3 times as long as the corresponding side of the smaller polygon. wHAT IS the ratio of the area of the larger polygon to the area of the smaller polygon. Walter Whiteley lui répond. 





Angles in Polygons 
19990121 

Jen pose la question :
 How do u find the interior angles of a pentagon when you are given 4 of the angles and you need to find the fifth?
 If you are given the measure of each exterior angle of a regular polygon, how do you figure out how many sides the polygon has?
 i need all information on polygons and how to find their angles!!!
Jack LeSage lui répond. 





A Kite 
19981007 

Paul Scott pose la question : What is the mathematical term for the kite shape? Walter Whiteley lui répond. 





Tessellations of nonpolygons 
19980224 

Ellen Goldwasser pose la question : Hi! My name is Ellen Goldwasser. I'm a seventh grade student and I'm doing a prodject on tessellation. My question is: why will certain shapes (not polygons) tessellate? Thanks for your help! Penny Nom lui répond. 





Names of the Polygons 
19970304 

Manuel pose la question : What do you call a 13 sided polygon? Is there a list of the different names? Walter Whiteley and Harley Weston lui répond. 





Sides in a Regular Polygon 
19961206 

Rick Moss pose la question : If you are given the measure of each interior angle (162 degrees) of a regular polygon. How many sides does the polygon have? Penny Nom lui répond. 

