Discussion:  All Topics 
Topic:  right triangles 
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Subject:  Spherical Geometry 
Author:  Joel Duffin 
Date:  Sep 24 2003 
the surface of a sphere, the sum of the angles of a triangle is not necessarily
180. Resulting in the pythagorean theorem not being true there. Interestingly,
equivalent versions can be derived for these noneuclidean spaces.
http://torus.math.uiuc.edu/jms/java/dragsphere/
 
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