1. Warm Up 04.11.12 Week 4

2. Section 11.1 Day 1 I will find the measures of interior and exterior angles of a polygon. 180 ⁰ 360 ⁰ 540 ⁰ 720 ⁰ 3 sides 4 sides 5 sides 6 sides Ex 1 1 2 180 3 1804 180

3. Ex 2 Polygon Interior Angles Theorem The sum of the measures of the interior angles of a convex n-gon is ( n – 2 ) 180 ⁰. Theorem 10.15 ( 6 – 2 ) 180 ⁰ 4 180 ⁰ 720 ⁰ 136⁰ + 136⁰ + 88⁰ + 142⁰ + 105⁰ + x⁰ = 720⁰ 607 + x = 720 x = 113 6 5 4 3 2 1

4. Ex 3 The measure of each angle of a regular polygon is 140. How many sides? Polygon Interior Angles Theorem Theorem 10.15A 9 sides

5. Ex 4Find the value of x for the regular polygon: x

6. Assign ment: Textbook Page 665, 14 – 19 all. Do 1: What is the value of x?