tan(36)

http://www.mathisfunforum.com/viewtopic … 87#p378587

The Regular Icosahedron

http://www.mathisfunforum.com/viewtopic.php?id=22966

Note: I was having difficulty making my answer match the one given by Monox D. I-Fly. I have worked out the two versions are the same but I cannot get the final proof to post; why I don't know. So I'll try again later

Base Vectors and Coordinates. A beginning.

http://www.mathisfunforum.com/viewtopic … 53#p387953

A matrix for rotation and the compound angle formulas

http://www.mathisfunforum.com/viewtopic … 28#p389628

Bob

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