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The diagonals of a polygon 2016-01-29
From Sofia:
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!
Answered by Harley Weston.
The diagonals of a cube 2016-12-02
From Peter:
when u have a cube and the inner diagonal is 41.6 how long is the outside diagonal
Answered by Penny Nom.
The diagonal of a 10 acre square 2016-04-11
From Derrick:
I own 100 acre square of land. I want to run from farthest corner of property to farthest corner, Diagonally. How many miles would I have traveled?
Answered by Penny Nom.
The diagonal of a rhombus 2015-11-14
From Om:
In a rhombus ABCD, angle A=60 and side AB=6 cm. Then diagonal BD is ?
Answered by Penny Nom.
The diagonals of a cube 2014-09-04
From Rukshanth:
How many diagonals does a cube have?
Answered by Harley Weston.
Intersection points and diagonals 2013-09-11
From Kenneth:
I was wondering, is there a relationship between the number of sides of a regular n-gon 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.

Answered by Chris Fisher.
The diagonals of a parallelogram 2011-02-17
From ginger:
Find the diagonals of parallelogram where the the side is 40 and the bottom side is 15.
Answered by Penny Nom.
Sides and diagonals of a polygon 2010-11-25
From nicky:
The sum of sides of two polygons is 12 and the sum of their diagonals is 19. What kind of polygon are they?
Answered by Penny Nom.
The diagonals of a rectangle 2010-03-30
From Tabatha:
The diagonals of a rectangle are 8 units long and intersect at a 60 degree angle. Find the dimensions of the rectangle.
Answered by Penny Nom.
A diagonal of an octagon 2010-03-02
From cody:
I have an octagon 3ft tall by 3ft wide. What are the lengths of the diagonal lines to the vertical and horizontal lines (b and b)?
Answered by Penny Nom.
Loading a headboard in a uhaul 2010-01-20
From gina:
I have a uhaul 9'10" long 4"9"wide 4'7"height I have a headboard 74 inches in height would it fit the box diagonally
Answered by Penny Nom.
Polygons, diagonals and the sum of the measures of the angles 2009-12-18
From jason:
find the set of polygons in which the number of diagonals is greater than the sum of the measures of the angles
Answered by Robert Dawson.
A diagonal of a rectangle 2009-07-01
From Ruben:
Please assist me with the following problem: 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? Thanks
Answered by Harley Weston.
The sides of a parallelogram 2009-03-17
From Sami:
If ABCD is a parallelogram, prove that line AB is congruent to line CD. Clearly state your reasons and conjectures.
Answered by Penny Nom.
A walkway through a park 2009-03-07
From felicia:
a diagonal walkway through a park is 18 meters long. If the park is a square, how long is one of its sides to the nearest tenth of a meter?
Answered by Penny Nom.
A shape with 10 sides 2009-03-03
From Sandra:
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?
Answered by Penny Nom.
Diagonals of a polygon 2009-02-16
From Julie:
How many diagonals can be drawn from one vertex in a 12-sided polygon?
Answered by Leeanne Boehm.
A chord 2009-01-01
From Deepa:
Why in a circle,a chord is called as the longest diameter? (A chord does not passes through the centre of the circle but a diameter passes through the centre)
Answered by Penny Nom.
The diagonals of an isosceles trapezoid 2008-11-14
From hazel:
how to solve the diagonals of an isosceles trapezoid? what is the formula?
Answered by Harley Weston.
A square with diagonal 200 metres 2008-08-20
From kelvin:
find the are and perimeter of a square with diagonal of 200 meters?
Answered by Penny Nom.
Perimeter, area and diagonals of a rectangle 2008-04-03
From jenea:
I have to find the perimeter as well as the area of a rectangle when given the diagonals are 12 units long and they intersect at a 60 degree angle. how do i find both the area and perimeter; do i use the 30 60 90 triangle rule?
Answered by Stephen La Rocque and Penny Nom.
The diagonals of a hendecagon 2008-03-10
From karan:
How many diagonals does a hendecagon have?
Answered by Penny Nom.
A line drawn between 2 vertices 2008-02-26
From Arshad:
what is a line drawn between 2 vertices which are not next to each other called.
Answered by Penny Nom.
The diagonal of a rectangle 2008-02-21
From tim:
is there a formula for finding the diagonal of a rectangle?
Answered by Penny Nom.
The diagonal of a cube 2008-02-10
From Praveen:
Given a Cube's diagonal, how does one find the edge of the cube.
Answered by Stephen La Rocque.
The width of a rectangle is 4 less than twice its length. 2008-02-09
From Shawn:
The width of a rectangle is 4 less than twice its length. If the area of the rectangle is 72 cm, what is the length of the diagonal
Answered by Stephen La Rocque.
Cantor's diagonal argument 2008-01-26
From David:
Cantor's theory using a diagonal across a list of real numbers to proven uncoutability has always puzzled me.First in base ten, it feels like hocus pocus so I began thinking of the Boolean numbers as truer representations of place value (on,off). Secondly his list was always arbitrary or so I recollect. Therefore, I suggested using a seriesA=.10000....,B=.01000. C=.11000, etc. Any diagonal is already located among the numbers listed. My only alteration is that since the final digit is always unrepresentably either one or zero, but it must be one or the other, I make an assumption that if x= .abc...1 and y= .abc...2 the only two possibilities and I choose to count F=x+y then then the numbers are countable= Z=sumFi,where I=2+2^2+2^3...

I hope this sketch is enough description, I asked Rudy Rucker more formally but got no mathematical response, someone else gave me some tale about slippery epsilon. What do tyou think of recasting his proofs in more rigorous form? David French

Answered by Claude Tardif and Walter Whiteley.
A line between 2 vertices 2007-10-28
From robert:
what do we call a line between 2 vertices which are not next to each other
Answered by Walter Whiteley.
The diagonal of a square 2007-09-23
From Nasreen:
A(7,2) and C(1,4) are two vertices of a square ABCD find in the form ax+by=c the equation of the diagonal BD
Answered by Stephen La Rocque.
A rectangular sheet of paper is folded along the diagonal 2007-09-01
From Amit:
A rectangular sheet of a paper with dimensions a and b is folded along its diagonal. What is the area of the overlapped region?
Answered by Harley Weston.
Diagonals on a cylinder 2007-08-10
From John:
I have a cylinder that is 37.5" width X 25.25" circumference. I need to create a repeating diagonal lined pattern on the cylinder so that when it prints it joins perfectly at the circumference repeat. The design must follow these specs. Black diagonal lines need to be 1.250" max width X 1.5" max spacing between the black lines. Please Help
Answered by Stephen La Rocque.
How many diagonals does a polygon have? 2007-07-18
From Edna:
how do you find the numbers of diagonals of a polygons?
Answered by Stephen La Rocque.
a^2 + b^2 = c^2 2007-03-04
From Colburn:
27 feet long base 14 feet height what is the diagonal
Answered by Stephen La Rocque.
Diagonals of a rectangular grid 2007-02-21
From matthew:
in a rectangular grid 3600x288 (or any large rectangle with an even number of units) how can I determine the number of vertices a diagonal line will pass through?
Answered by Stephen La Rocque and Penny Nom.
How many diagonals does a hexagon have? 2007-02-03
From Marsha:
How many diagonals does a hexagon have?
Answered by Stephen La Rocque.
The diagonals of a parallelogram are mutually bisecting 2007-01-21
From Greta:
I am having trouble proving that the diagonals of a parallelogram are mutually bisecting.
Answered by Penny Nom.
Can you characterize ALL polygons by the number of diagonals it has? 2006-12-17
From Katie:
Can you characterize ALL polygons by the number of diagonals it has?
Answered by Penny Nom.
The diagonals of a trapezoid 2005-11-11
From Chris:
Is there ever a case where the diagonals of a trapezoid bisect each other?
Answered by Walter Whiteley.
The diagonals of a hexagon 2005-08-15
From Brittany:
are all of diagonals in a hexagon has same length
Answered by Penny Nom.
A line segment connecting two vertices of a polygon 2005-02-02
From James:
What is a line segment (not a side) connecting two vertices of a polygon called?
Answered by Penny Nom.
Probability 2004-12-04
From A parent:
Consider a 30 sided polygon. If three diagonal are selected at random, what is the PROBABILITY that they share a common endpoint?
Answered by Denis Hanson.
Diagonals in a regular dodecahedron 2004-05-15
From Joshua:
A dodecahedron has twelve faces, all of which are regular pentagons. Three edges meet at each vertex of the dodecahedron. An interior diagonal is a segment connecting two vertices such that the segment is not an edge or along a face of the dodecagedron. How many interior diagonals does a regular dodecahedron have?
Answered by Penny Nom.
Diagonals in an octagon 2003-11-13
From Glenn:
Question 1.
What is the probability of choosing the longest diagonal in an octagon?

Question 2.
Probability of choosing the shortest?
Answered by Andrei Volodin and Penny Nom.

Diagonals in an octagon 2003-08-04
From Amanda:
How many diagonals are in an octagon??? What would be a drawing of those diagonals???
Answered by Penny Nom.
Diagonals in a polygon 2002-04-10
From Murray:
If you have a regular polygon with n sides and you draw all (n-3)n/2 diagonals how many intersection will they form with each other and how many sections will they devide the polygon into.
Answered by Caude Tardif and Chris Fisher.
The diagonal 2001-03-28
From Candace:
Building measuring 40 feet 3 inches by 50 feet 3inches What is the measurement of the diagonal of the building? What was method of obtainin answer?
Answered by Andrei Volodin.
order 4+ determinants 1999-12-06
From Joe Kron:
Why is it never shown how to calculate the value of 4x4 (or larger size) deteminants by the diagonal multiply methods that are generally shown for 2x2 and 3x3 determinants? The method I'm talking about is called Cramer's Rule??? Is this method not extensible to order 4+ and if not why not? Anyway the method always shown for order 4+ is called "reduction by minors" which is not the answer to this question.
Answered by Walter Whiteley.
 
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