Subject: What's a triangle
Date: Fri, 26 Jul 96 21:29
From: Alex Bogomolny

Dear Kimberly:

I believe you are right. A triangle is a two-dimensional figure. The triangle inquality

AC≤AB+BC

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.

Sincerely,
Alex

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