Where does the interior angle sum theorem come from

The video tutorial introduces polygons, discussing their types and side lengths. It explains how to calculate the sum of angles in polygons and demonstrates creating diagonals to find triangles within them. The tutorial concludes with a rule for determining the sum of angles in any polygon.

What do we call a polygon with three sides?

Can you name some specific types of four-sided polygons?

What do we call a polygon with six sides?

What is the sum of the angles in a triangle?

How many triangles can be formed in a quadrilateral?

What is the relationship between the number of sides in a polygon and the number of triangles that can be formed?

How do you calculate the sum of the interior angles of a polygon?