Drawing 9 diagonals within a regular hexagon ensures that all its vertices are connected.

How many triangles there are in the newly created drawing?

(In reply to re(4): by my count -- proposed solution -- missed a set by broll)

I see that triangles of the type AOC/E were missed, but there are 12 of those and now there's an overcount of 6, so I must have counted some type twice.

Edit: sorry; I take that back--there are still 6 unaccounted for; I was basing this on the different lettering scheme in the reference vs my own.

Edited on November 24, 2010, 7:32 pm

Posted by Charlie on 2010-11-24 18:46:18