







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. 





A square and a triangle 
20181203 

Livvy pose la question : a square with a perimeter of 48 and a triangle with a perimeter of 38. when they are joined they make a pentagon. please find the perimeter
how can you find the perimeter of this. could you please help me? Penny Nom lui répond. 





Two regular pentagons 
20180319 

Kip pose la question : The ratio of the corresponding apothems of two similar regular pentagons is 5:7 What is the ratio of their areas? Penny Nom lui répond. 





Needing the area of an irregular Pentagon 
20171206 

Dale pose la question : I'm needing to find the square footage of an irregular pentagon.
I've seen the other questions similar to this one, but without a great deal of difficulty can't get you the angle degrees, or the length between opposing angles.
I'm hoping that a different bit of information can help. So here goes:
The longest side is 67ft long.
One of its legs is 39ft long, and the other is 18ft long.
The leg off of the other end of the 39ft leg is 35ft long.
The leg off of the other end of the 18ft is 49ft long, and meets the other end of the 35ft side.
The information that I DO have, which I'm hoping makes the difference, is that the 39ft and the 18ft sides are parallel.
Also, while the angles at each end of the 67ft side are not right angles, they are fairly close to it,
approximately 80 degrees at the 39 ft side corner, and 100 degrees at the 18ft side corner.
Dale. Harley Weston lui répond. 





A barn roof 
20160529 

Joe pose la question : Is it possible to build a barn roof (irregular pentagon?) with a 12' base and the other 4 sides 4' each? Thanks. Penny Nom lui répond. 





A pentagon inscribed in a circle 
20150530 

Victoria pose la question : find the area of a regular pentagon inscribed in a circle with radius 3 units Penny Nom lui répond. 





The area of a pentagon 
20141104 

Gracie pose la question : i really need help with this problem in my math book, will you help?
"Derrick drew regular pentagon with side lengths of 8 centimeters.
He divided the pentagon into 5 identical triangles, and measured the
height of one of the triangles to be 5.5 centimeters. Find the area of
the pentagon."
this really makes no sense to me. Can you help me with anything
to make it easier?
THANKS!!!!! Penny Nom lui répond. 





Drawing a pentagon 
20130506 

jacob pose la question : hello. i am trying to draw a template for a project. but i don't have a
protractor. i'm trying to draw a normal pentagon with 2cm sides. what
i'm trying to figure out is the distance in centimeters from point a, to c,
in a straight line. this is needed so that i can measure and create the
shape without a protractor, and keep the angles and sides correct.
if you can help me with the measurement, or help me another way,
any help would be greatly appreciated. thank you. Penny Nom lui répond. 





A 5 pointed star in a circle 
20120805 

wiljohn pose la question : find the area of a 5 pointed star in the circle with a radius of 12.517 Chris Fisher lui répond. 





Drawing an isosceles triangle 
20120510 

Nazrul pose la question : How can I draw an isosceles triangle whose each angle adjacent to the base is twice the vertex angle? Chris Fisher 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. 





A regular pentagon 
20091214 

Jamie pose la question : A regular pentagon is inscribed in a circle of radius 4.5 cm.
Determine its perimeter and area to one decimal place!
Thank YOU ! :) Penny Nom lui répond. 





Two similar pentagons 
20091116 

louis pose la question : The lengths of five sides of a pentagon are 1,3,5,7,and 12 units. If the length of the longest side of a similar polygon is 18 units, find the perimeter of the larger pentagon. I think I figured it out Not sure though. Penny Nom 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. 





A pentagon inscribed in a circle 
20090729 

Faisal pose la question : O is the center of the circle. Sides AB and AE are equal. Angle B = 95,
angle C = 130, angle D = 138. Find angles A and E.
Diagram is attached.
Best,
Faisal Chris Fisher lui répond. 





The interior angles of a pentagon 
20090420 

Mary pose la question : If four interior angles of a fivesided figure pentagon measure 100 degrees each, what will the fifth angle measure? Harley Weston lui répond. 





The perimeter of a pentagon 
20090407 

Malysa pose la question : A pentagon has an area of 1400 cm squared. Determine its perimeter. Harley Weston lui répond. 





Symmetries of a polyhedron 
20090302 

Vincent pose la question : I want to ask is there a formula to find out the number of axes of rotation & plane
of reflection of a 3D figure, like pentagon, pyramid? Chris Fisher lui répond. 





A word problem about a regular pentagon 
20081116 

Sandra pose la question : If the area of a regular pentagon is A=1.720a^2, in which a is one of the sides. Find the area of a regular pentagon with a side that measures 50cm. Chris Fisher and Penny Nom lui répond. 





A fivesided coin 
20080629 

carla pose la question : A new fivesided coin is to be made in the shape of figure 8.6
The point A on the circumference of the coin is the centre of arc CD, which has a radius of 2cm
Similarly B is the centre of arc DE, and so on.
Find the area of one face of the coin. Harley Weston lui répond. 





The area of a regular pentagon 
20080602 

Jenna pose la question : I would like to know if there is a formula to find the area of a regular Pentagon that is not inscribed in a circle only apothem and side length are given. Penny Nom lui répond. 





The angles of an irregular pentagon 
20080520 

victoria pose la question : The sum of the measure of two angles is 240. If the remaining angles are congruent, what is the measure of each angle? Penny Nom lui répond. 





The area of an irregular pentagon 
20080402 

shane pose la question : i Need to find out what this adds up to i have a diagram of a pentagon and all the shides are different how do i do this if the sides are 5100,7200,7200,7400,7400 Harley Weston lui répond. 





A fish tank in the shape of an irregular pentagon 
20080329 

richie pose la question : i am building a fish tank. it is going to be an irregular pentagon. the sides are going to be
24"
24"
8"
8"
32"(approximately)
there will 3 right angles A, B, E
my question is how to figure out the degree of the angles that are not right angles (C,D)? Chris Fisher lui répond. 





A pentagon inscribed in a circle 
20080319 

Elaine pose la question : My question as written on my homework is: Given a pentagon inscribed in a circle of radius r, determine a) the angle between any two sides of the pentagaon b) the perimeter of the pentagaon c) the area of the pentagon. I know this kind of counts as three questions, so if you can only answer one, that's okay. Any help will be much appreciated. Thanks! Stephen La Rocque lui répond. 





A three dimensional object 
20080304 

Briana pose la question : what is the 3d term for pentagon? like a circle is a shhere? Penny Nom lui répond. 





Two regular pentagons 
20080227 

Shirley pose la question : Regular pentagon QRSTU has a side length of 12 centimeters and an area of
248 square centimeters. Regular pentagon VWXYZ has a perimeter of 140
centimeters.
I need to find its area. Stephen La Rocque lui répond. 





A triangle and a pentagon 
20071208 

Olivia pose la question : A regular pentagon has an area of 800 square centimetres. What is the area of the triangle extended from one side of the pentagon? Stephen La Rocque lui répond. 





The area of a regular pentagon 
20071101 

sarah pose la question : i'm trying to find the area of a regular pentagon with 200m sides, ive split it into 5 triangles so i dont know either sizes of the lengths and i need to find the height!
how? Penny Nom lui répond. 





All five angles of a pentagon ABCDE are equal 
20070804 

Jerry pose la question : All five angles of a pentagon ABCDE are equal. The diagonals AC, AD and BD have the same length. Prove that all five sides of the pentagon are equal in length. Penny Nom lui répond. 





Find the area of a regular pentagon inscribed in a circle 
20070803 

Tracy pose la question : Can you please help me with finding the area of a regular pentagon inscribed in a circle using the Pythagorean theorem. The radius of the circle is 5 cm and each side AB = BC = CD = DE = EA = 6 cm. Stephen La Rocque, Leeanne Boehm and Chris Fisher lui répond. 





Area of a star in a regular pentagon with side length 10cm 
20070724 

Chetna pose la question : A regular pentagon with side 10 cm has a star drawn within (the vertices match).
What is the area of the star? Stephen La Rocque lui répond. 





Area of a pentagonal lot 
20070509 

Mimi pose la question : I would like to know the square footage of a pentagon with the
following measurements:
Property is .43 of an Acre
Front: 57.11'
NW: 105.78'
S: 120'
SE: 145'
E: 102.86'
I don't want you to try to show me how to work thru the problem since
I will never comprehend it. For some reason, I am unable to perform these
kinds of equations. I will greatly appreciate your help. Penny Nom lui répond. 





The area of an irregular pentagon 
20070414 

Steven pose la question : I have been given a coursework in which i have to investigate various shapes to find the one that would give the largest area with 1000m perimeter.
I'm stuck in a part where i have to calculate the area of a irregular pentagon. i don't know where to start from. I can make up the length of all the sides (5 sides), so long they add up to 1000, but i'm not quite sure what to do after that. Penny Nom lui répond. 





Reducing the over all size of a irregular pentagon 
20070411 

Gilbert pose la question : I'm having trouble figuring out how to reduce the over all size of a irregular pentagon.
The pentagon I'm trying to reduce has 2 right angles adjacent to each other.
Basically the shape of a house. I have width, length of the legs and the height of the peak.
But cannot figure out how to get the size of a reduced version that keeps the same proportion
and angles.
Thanks
Gilbert Penny Nom lui répond. 





An irregular pentagon 
20070411 

reg pose la question : Hi, i have been given an irregular pentagon in which i have to work out the area.
I have been told to make three triangles and then work out the area of these triangles and then add them up.
I require your help because i have the length of two sides of one of the triangle  how do i work out the other side?
I have not been provided with any angles  can i make the angles up? Penny Nom lui répond. 





The area of an irregular pentagon 
20070326 

grace pose la question : hi I am doing graphics and need to find the area of the section given to us (it is just drawn). the sides measure 15m, 35.4m, 5m, 17.8m, 35.7m. the angle between the 15m side and the 35.4m side is 17degrees, the angle between the 35.4m side and the 5m side is 73degrees. the angle between the 5m side and the 17.8m side is 151degrees, the angle between the 17.8m side and the 35.7m side is 90degrees and the angle between the 35.7m side and the 15m side is 95degrees. if you could tell me the area i would be extremely grateful. thanks very much. Penny Nom lui répond. 





An irregular pentagon 
20070308 

kelly pose la question : If I have a pentagon with 2 sides of length 5 and one with a length of 2, what are the lengths of other 2 sides? Stephen La Rocque lui répond. 





The net for a pentagonal pyramid 
20070305 

MaKayla pose la question : How many bases does the net for a pentagonal pyramid have? Penny Nom lui répond. 





A pentagon inscribed in a circle 
20070222 

Amanda pose la question : Find the formula for calculating the length of the side of a pentagon given the radius of the circle that encloses it. Once you find the formula, find the length of the side of a pentagon which is enclosed in a circle 12 cm in diameter. So I need to know the formula, and the length of the side of the pentagon. Thank you!! Penny Nom lui répond. 





The area for a pentagon 
20070209 

nicole pose la question : how do you find the area for a pentagon Stephen La Rocque lui répond. 





Splitting a 5 acre piece of property 
20070125 

John pose la question : I have a 5 acre piece of property that I wish to split into 5 individual 1 acre parcels. The 5 acre parcel 1s 660 feet in length and 330 feet in width. The first two parcels are 264'x165', but I am asking for help getting the perimeters of the last 3 lots, one of which is a irregular pentagon. All of the one acre parcels must have an area of 43,560 square feet each. Penny Nom lui répond. 





A regular pentagonal pyramid 
20070125 

Vickifazio pose la question : a regular pentagonal pyramid has a base perimeter of 1,085 ft. How long is one side of the base? Stephen La Rocque lui répond. 





How do the perimeters of the two pentagons compare? 
20070102 

Robert pose la question : If the area of one pentagon is eightyone times the area of another pentagon, how do the perimeters of the two pentagons compare? Penny Nom lui répond. 





The area of regular pentagon inscribed in a circle 
20061012 

Admire pose la question : i need help on how to find area of regular pentagon inscribed in a circle of radius 8cm Stephen La Rocque and Penny Nom lui répond. 





The area of a pentagon 
20060511 

Jessica pose la question : i have to find the area of a pentagon ABCDE whose vertices are A (2,5), B (2,2),C(2,4), D(5,2) and E(4,2) Stephen La Rocque lui répond. 





The area of a pentagon 
20060201 

Edward pose la question : I am working on finding the Sq. ft of a pentagon. I saw another question like it but I am lost. I have a pentagon that is 6ft on every side what is the Sq Footage of that pentagon? Penny Nom lui répond. 





The area of a pentagon 
20050824 

Susan pose la question : I need to calculate the square footage of a regular pentagon (all angles are equal). Each side is 16 feet long. Penny Nom lui répond. 





An irregular pentagon 
20050223 

Tony pose la question : Please help me with confirming the area in square footage of the irregular pentagon
My Name is Tony and I am working on understanding the square footage as calculated in the drawing. I also believe this is a secondary level question.
I saw the example http://mathcentral.uregina.ca/QQ/database/QQ.09.03/dana2.html and would appreciate how you worked through the problem, but couldn't find the calculations so that I could adapt them to my sizes. Penny Nom lui répond. 





The area of a pentagon 
20040606 

Dana pose la question : HELLO, I NEED HELP IN DETERMINING THE SIZE OF A PENTAGON.
one side is 280',from both ends of the 280 'section,we have 300' lengths,from one of these 300' sections we have a 118' length,which goes over to a length of 228',will this be enough info. or should i provide more. thanks Penny Nom lui répond. 





Sum of the angles in a pentagon 
20040311 

Ashish pose la question : What is the sum of all the measures of the angles of a Pentagon 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. 





Construct a pentagon 
20021212 

Mary pose la question : We were wondering what the instructions/formula, stepbystep, is to make a pentagon. Chris Fisher and Penny Nom 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. 





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. 





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. 





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. 

