My friend finished making dodecahedrons, and her next project is to make regular icosahedrons (20-sided dice). Again she wants to know: what is the dihedral angle between any two adjacent faces?

Perhaps this can be solved without the use of spherical trig? ;P

(In reply to solution without spherical trig by Charlie)

Thanks for humoring me, Charlie. lol

Posted by Bryan on 2003-04-17 04:41:25