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pentagon

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Finding the area of a regular polygon 2007-05-04
From Dana:
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?
Answered by Stephen La Rocque.
The area of a pentagon 2014-11-04
From Gracie:
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!!!!!

Answered by Penny Nom.
Drawing a pentagon 2013-05-06
From jacob:
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.
Answered by Penny Nom.
A 5 pointed star in a circle 2012-08-05
From wiljohn:
find the area of a 5 pointed star in the circle with a radius of 12.517
Answered by Chris Fisher.
Drawing an isosceles triangle 2012-05-10
From Nazrul:
How can I draw an isosceles triangle whose each angle adjacent to the base is twice the vertex angle?
Answered by Chris Fisher.
The interior angles of a pentagon 2011-03-10
From Daima:
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

Answered by Penny Nom.
A regular pentagon 2009-12-14
From Jamie:
A regular pentagon is inscribed in a circle of radius 4.5 cm. Determine its perimeter and area to one decimal place!

Thank YOU ! :)

Answered by Penny Nom.
Two similar pentagons 2009-11-16
From louis:
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.
Answered by Penny Nom.
An area problem 2009-08-30
From Amber:
Area of hexagon ABCDEF with the vertices (3,0) (7,0) (9,2) (7,4) (3,4) (1,0)
Answered by Harley Weston.
A pentagon inscribed in a circle 2009-07-29
From Faisal:
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
Answered by Chris Fisher.
The interior angles of a pentagon 2009-04-20
From Mary:
If four interior angles of a five-sided figure pentagon measure 100 degrees each, what will the fifth angle measure?
Answered by Harley Weston.
The perimeter of a pentagon 2009-04-07
From Malysa:
A pentagon has an area of 1400 cm squared. Determine its perimeter.
Answered by Harley Weston.
Symmetries of a polyhedron 2009-03-02
From Vincent:
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?
Answered by Chris Fisher.
A word problem about a regular pentagon 2008-11-16
From Sandra:
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.
Answered by Chris Fisher and Penny Nom.
A five-sided coin 2008-06-29
From carla:
A new five-sided 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.
Answered by Harley Weston.
The area of a regular pentagon 2008-06-02
From Jenna:
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.
Answered by Penny Nom.
The angles of an irregular pentagon 2008-05-20
From victoria:
The sum of the measure of two angles is 240. If the remaining angles are congruent, what is the measure of each angle?
Answered by Penny Nom.
The area of an irregular pentagon 2008-04-02
From shane:
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
Answered by Harley Weston.
A fish tank in the shape of an irregular pentagon 2008-03-29
From richie:
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)?

Answered by Chris Fisher.
A pentagon inscribed in a circle 2008-03-19
From Elaine:
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!
Answered by Stephen La Rocque.
A three dimensional object 2008-03-04
From Briana:
what is the 3d term for pentagon? like a circle is a shhere?
Answered by Penny Nom.
Two regular pentagons 2008-02-27
From Shirley:
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.

Answered by Stephen La Rocque.
A triangle and a pentagon 2007-12-08
From Olivia:
A regular pentagon has an area of 800 square centimetres. What is the area of the triangle extended from one side of the pentagon?
Answered by Stephen La Rocque.
The area of a regular pentagon 2007-11-01
From sarah:
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?
Answered by Penny Nom.
All five angles of a pentagon ABCDE are equal 2007-08-04
From Jerry:
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.
Answered by Penny Nom.
Find the area of a regular pentagon inscribed in a circle 2007-08-03
From Tracy:
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.
Answered by Stephen La Rocque, Leeanne Boehm and Chris Fisher.
Area of a star in a regular pentagon with side length 10cm 2007-07-24
From Chetna:
A regular pentagon with side 10 cm has a star drawn within (the vertices match). What is the area of the star?
Answered by Stephen La Rocque.
Area of a pentagonal lot 2007-05-09
From Mimi:
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.
Answered by Penny Nom.
The area of an irregular pentagon 2007-04-14
From Steven:
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.
Answered by Penny Nom.
Reducing the over all size of a irregular pentagon 2007-04-11
From Gilbert:
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
Answered by Penny Nom.
An irregular pentagon 2007-04-11
From reg:
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?

Answered by Penny Nom.
The area of an irregular pentagon 2007-03-26
From grace:
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.
Answered by Penny Nom.
An irregular pentagon 2007-03-08
From kelly:
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?
Answered by Stephen La Rocque.
The net for a pentagonal pyramid 2007-03-05
From MaKayla:
How many bases does the net for a pentagonal pyramid have?
Answered by Penny Nom.
A pentagon inscribed in a circle 2007-02-22
From Amanda:
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!!
Answered by Penny Nom.
The area for a pentagon 2007-02-09
From nicole:
how do you find the area for a pentagon
Answered by Stephen La Rocque.
Splitting a 5 acre piece of property 2007-01-25
From John:
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.
Answered by Penny Nom.
A regular pentagonal pyramid 2007-01-25
From Vickifazio:
a regular pentagonal pyramid has a base perimeter of 1,085 ft. How long is one side of the base?
Answered by Stephen La Rocque.
How do the perimeters of the two pentagons compare? 2007-01-02
From Robert:
If the area of one pentagon is eighty-one times the area of another pentagon, how do the perimeters of the two pentagons compare?
Answered by Penny Nom.
The area of regular pentagon inscribed in a circle 2006-10-12
From Admire:
i need help on how to find area of regular pentagon inscribed in a circle of radius 8cm
Answered by Stephen La Rocque and Penny Nom.
The area of a pentagon 2006-05-11
From Jessica:
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)
Answered by Stephen La Rocque.
The area of a pentagon 2006-02-01
From Edward:
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?
Answered by Penny Nom.
The area of a pentagon 2005-08-24
From Susan:
I need to calculate the square footage of a regular pentagon (all angles are equal). Each side is 16 feet long.
Answered by Penny Nom.
An irregular pentagon 2005-02-23
From Tony:
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.

Answered by Penny Nom.
The area of a pentagon 2004-06-06
From Dana:
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

Answered by Penny Nom.
Sum of the angles in a pentagon 2004-03-11
From Ashish:
What is the sum of all the measures of the angles of a Pentagon
Answered by Penny Nom.
Constructions of polygons 2003-01-03
From Garrett:
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?
Answered by Chris Fisher.
Construct a pentagon 2002-12-12
From Mary:
We were wondering what the instructions/formula, step-by-step, is to make a pentagon.
Answered by Chris Fisher and Penny Nom.
A polygon with five sides 2001-10-03
From A student:
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
Answered by Penny Nom.
Area of a regular polygon 2001-05-01
From Carl:
What is the formula for finding the area of a regular Hexagon and a regular Pentagon
Answered by Penny Nom.
An irregular polygon 2001-02-09
From Jason:
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.
Answered by Chris Fisher.
Angles in Polygons 1999-01-21
From Jen:
  • 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!!!

Answered by Jack LeSage.
 
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