
Re: circumference in degrees of a triangle
Posted:
Nov 22, 2003 11:36 PM


Jim Totten wrote:
> Here's a question: > Can you, leaving your Parallel Postulate at home, and going for a walk > around a triangle, PROVE that its interior angles add to 180?
Noand neither can anyone elseunless you allow some equivalent of the Parallel Postulate. The condition that the sum of the interior angles of some triangle be 180 degrees is itself an equivalent of the Parallel Postulate.
Lou Talman Department of Mathematical & Computer Sciences Metropolitan State College of Denver

