1. Module 15: Lesson 1 Interior & Exterior Angles
An interior angle of a polygon is one formed by the sides of a polygon with a common vertex.
An exterior angle of a polygon is one formed by one side of the polygon and the extension of an adjacent side.
The Triangle Sum Theorem
The sum of the measures of the 3 interior angles of a triangle = 180°.

2. 180°(n - 2) (where n is the number of sides of the polygon)
The Polygon Angle Sum Theorem
The sum of the measures of the interior angles of any polygon is
180°(n - 2) (where n is the number of sides of the polygon)
See example 1 on page 727.
A regular polygon is a polygon that has all sides of the polygon with the same length and all interior angles with the same measure.

3. 2 1 3 4
The Exterior Angle Theorem
The measure of an exterior angle of a triangle is equal to the sum of the measures of the 2 remote interior angles.

4. 2 1 3 4
1) Find the measures of the other 3 angles if
2) Find the measures of the other 3 angles if

5. Homework pages 732-737 #’s 1-26 (all)