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Interior Angle Aggregate (
Posted on 20140916
)
Consider a piece of paper having shape of a triangle which we denote by triangle ABC.
Using paper folding alone, prove that the sum of the interior angles of the triangle ABC equals 180
^{o}
.
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Submitted by
K Sengupta
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alternate solution
Comment 2 of 2 
Bisect each of the angles to find the incenter.
Fold each of the corners in to the incenter.
The angles across from C is equal to C etc.
So 2A + 2B + 2C = 360
So A+B+C = 180
Posted by
Jer
on 20140916 12:07:39
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