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Topic:  right triangles 
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Subject:  Pythagorean theorem in noneculidean spaces 
Author:  Joel Duffin 
Date:  Sep 9 2003 
"the Pythagorean Theorem is derived from the axioms of Euclidean geometry and
does not apply to triangles in nonEuclidean spaces such as the surface of a
sphere"
http://www.wikipedia.org/wiki/Pythagorean_theorem
 
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