The Angle Sum Series

 If you wondered why is the angle sum of a triangle is 180 degrees, why is the formula of finding the angle sum of a polygon with n sides is 180(n-2), then this series is for you. 

The Angle Sum Series

Note that all these videos are in Taglish.

Proof of Sum of the Exterior Angles of a Polygon

After proving that the sum of the interior angles of a polygon is 180(n-2), where n is the number of sides, let us now prove that the sum of the exterior angles is 360 degrees. The exterior angle of a polygon is the angle formed after extending one side of a polygon. It is the supplementary of the adjacent interior angle.

The proof uses the polygon angle sum theorem.