Date: Mon, 4 Aug 1997 09:06:59 -0400 (EDT)

From: Alexander Bogomolny

Hello:

"The sum(#) of diagonals" looks to me ambiguous. # means a number, not a sum. The number of diagonals is easy to find: n(n-3)/2. And I hope it's what you need. For, far as I can judge, summing all the diagonals is messy and may sensibly be done only for the right n-gons and not for general convex ones.

Regards,

Alexander Bogomolny