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Interior Angle Aggregate (Posted on 2014-09-16) Difficulty: 2 of 5
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 180o.

No Solution Yet Submitted by K Sengupta    
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Solution 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 2014-09-16 12:07:39
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