1. Polygons and Quadrilaterals
©Tentinger

2.  How many sides do a pentagon, hexagon, and
heptagon have?
 What conjecture can you make about the sum of the
interior angles of each figure?

3. Angle Sum Theorem
 The sum of the measures of the interior angles of an
n-gon is (n – 2)180
 What is the measure of <G?
 What is the measure of <Y?

5. Polygon Exterior Angle Theorem
 The sum of the measures of the exterior angles of a
polygon, one at each vertex, is 360
 <1 + <2 + <3 + <4 + <5 = 360

7.  What is the measure of an exterior angle
of a regular 18-gon?
 What is the sum of measures of a polygon with 180
sides?

8. Homework
 Pg. 161
 #11 – 25, 40 – 44, 47 – 49
 23 problems