Theorem: The relationship between the number of sides of a polygon and its interior angle sum integrates both the minimum number of triangles that combine to form the polygon and the interior angle sum of triangles into a single theorem.
This theorem is called the Polygon Angle Sum Theorem.
Let S = interior angle sum of a polygon and n = the number of sides of the polygon.
Given what you know, which of the formulas below represents the Polygon Angle Sum Theorem?