geometry

If you are interested in Homotopy. An Old Conjecture Falls, Making Spheres a Lot More Complicated Honestly worth a read. Mathematical topology marches on.

A fun demo sent to me: http://sciencecenter.tumblr.com/post/38009799608/triangles-pythagorean-theorum-proof-water for those untrusting of the P. T. . :D:D:D

My hubby works making architectural cast stone. They make keystones, arches, coping, window trim, etc. Here is the dilemma, and it may be that the architects didn't provide enough information : They have a brick wall to make coping for. The front of it is level. On the left, it takes a...

I am doing a woodworking project that involves an interesting geometry problem. The piece is essentially a vertical hexagonal tube that I want to put a "roof" on. The roof peak is in the center of the hexagon and is 2 inches above the sides. Each side is 5 1/8 inches along the flat, and the...

I'm looking around the Internet for formulas for the area of a general quadrilateral (preferably with a proof or at least a diagram), and I find this sort of thing: Finding the area of quadrilaterals :eek:. I'm both horrified and curious about the author's motiviation. Then there is this one...

Hi. I am looking for a simple geometry drawing program. Nothing too elaborate with a steep learning curve. Just the axes in 2d so I can draw not very elaborate geometric figures and put and move coordinates, etc. Zooming in or out the drawing. Any suggestions. Thanks nimzo

In a true debate, both sides present their evidence or theories, rather than just one being hit with questions. So allow me to ask for your opinions or theories on why there are 2, 8, 18, and 32 electrons in the shells going outward from the Nucleus of an atom. You can of course say it is...

I could use some help here. My 9 year old niece was trying out some riddles on me, and one was this: If you head 5 miles south, then 5 miles east, then 5 miles back to your starting point, and you see a bear, what color is the bear? I started jabbering on about how that contradicted the...

Anyone have a particularly mathematically elegant way to describe the dynamic "yin yang"-like geometry diagram coded in java per http://winstone.us/DynamicYinYangGeometry.htm ?

This is a perfect octagon. Solve for the length of the exterior lines (X) http://corbinrussell.com/staging/oct.jpg

The Absolute Truth The parallel postulate either exists or it doesn't exist. And this is the absolute truth™. So, what does this tell us about any geometric notions we might have? That they are purely a matter of belief. I win this argument by use of the equivalence operator.

If one were to place two points as far as possible from each other on a sphere, they would be 180&#176 apart. Similarly, three points could be placed as far as possible from each other by positioning them 120&#176 from each other The optimal solition for four points would be to imagine a...

As I mentioned in another thread, I'm giving it a go at teaching myself calculus. Right now, I'm reviewing Geometry. What I need is an online source for problems I can work for practice, my book budget for the quarter having been totally used up. Anyone have recommendations?