1. LESSON 7.1 OBJ: The learner will use interior and exterior angles in a polygon. Do Now: Name the polygons with the given number of sides: 3, 4, 5, 6, 7, 8, 9, 10, 12

2. Types of Polygons:  Equilateral Polygon: all sides are equal  Equiangular Polygon: all angles are equal  Regular Polygon: a polygon that is both equilateral and equiangular

3. Interior Angles Theorem:  The sum of the measures of the interior angles of a convex n-gon is  The measure of each interior angle of a regular n-gon is

4. Examples: A. Find the sum of the measures of the interior angles of a heptagon B. Classify the polygon by number of sides, if the sum of the measures of the interior angles is 2160˚ C. Find the measure of one interior angle in a regular octagon

5. Examples: Find the missing angle D. E.

6. Exterior Angles Theorem:  The sum of the measures of the exterior angles of a convex polygon, one at each vertex, is 360˚

7. Examples: Find the missing angle(s) F. G.

8. Examples: H. Find the measure of an interior angle and exterior angle in a regular hexagon Homework: Pg 364 #3-27 odd