







A champagne tower 
20100416 

From gabriel: thanks for having something like this up online. My question is how do i build a Champagne Tower that has 290 glasses and 15 stories high.
Please help me out. this is for a clarity function. Answered by Robert Dawson. 





Tetrahedral numbers 
20091106 

From rena: consider the tetrahedral numbers 1,4,10,20, etc. Can these numbers be
described as a polynomial? If so, what is the degree of that polynomial? Answered by Stephen La Rocque. 





The volume of a closed 3D mesh object 
20090910 

From Ozen: I want to calculate the volume of a closed 3D mesh object having a surface made up
triangles. Answered by Robert Dawson. 





The bond angles of a tetrahedral polygon 
20010314 

From Nishi: 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 Answered by Harley Weston. 

