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**

- Proof that the Triangle Angle Sum is 180 Degrees
- Proof that the Quadrilateral Angle Sum is 360 Degrees
- The Polygon Angle Sum Proof
- Proof of Sum of the Exterior Angles of a Polygon

Note that all these videos are in Taglish.