Subject: What's a triangle
Date: Fri, 26 Jul 96 21:29
From: Alex Bogomolny
I believe you are right. A triangle is a two-dimensional figure. The triangle inquality
is said to hold for all triangles with the equality only attained when all three points lie on the same line. However, I would not be surprised if somebody considered this situation as a degenerate triangle. It's all very much a matter of terminology and convenience.