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Why do triangle angles always add up to 180?

Name: Anonymous 2007-06-15 1:28 ID:2ecQKiEM

Explain in the shortest manner possible in layman's terms and without oversimplifying.

Name: Anonymous 2007-06-17 1:49 ID:1iLJuqJy

>>12

Nice.  But layman might not understand why the outer angles of a "convex n-sided polygon have to add up to 360" so I'll just point out that it can be inscribed in a circle.
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