Below are the tutorials on Angle Sum Theorem. All links point videos on the **Sipnayan Youtube channel**. The link to the complete Playlist can be found **here**.

Lesson 1: A Brief Review of the Concept of Angles

Lesson 2: Proof that The Sum of the Interior Angles of Triangles is 180 degrees

Lesson 3: Proof that The Sum of the Interior Angles of a Quadrilateral is 360 degrees

Lesson 4: Proof that The Sum of the Interior Angles of a Pentagon is 540 degrees

Lesson 5: Sum of the Interior Angles of Any Polygon (Derivation)

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