Which regular polygons can be dissected into isosceles triangles by nonintersecting diagonals?
(In reply to
Not sure if this is what you want by Larry)
You know, I wish someone had caught this in the queue. I really like how concise the original is but you pointed out a big flaw. The problem is the term nonintersecting. Intersections at the vertices of the polygon I meant to allow. So your hexagon example is fine. Actually I think your square example is the only case where the diagonals don't share any endpoints.
As for the term dissected, the term generally means completely split up. Otherwise any ngon can be split into an isosceles triangle and an (n1)gon.
So here's the (hopefully better) version:
Which regular polygons can be dissected into isosceles triangles by diagonals that may only intersect at their endpoints?

Posted by Jer
on 20120121 00:05:43 