**Focus Question: What are the size of each angle and the sum of all angles in a regular polygon with n sides?**

The students will review what is important in a polygon and how regular and irregular polygons compare. The goal is for students to develop formulas the sum of interior angles for a polygon of n sides.

S - Sum of all angles

S = 180 (n - 2)

when n = any number of sides of a polygon

A - measure of one angle

A = 180 (n - 2)/ n

OR

A = 180 - 360/n

when n = any number of sides of a polygon

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