Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 2 - Section 2.5 - Convex Polygons - Exercises - Page 116: 45b



Work Step by Step

I=$\frac{(n-2)180}{n}$ 140=180-$\frac{360}{n}$ 40=$\frac{360}{n}$ n=$\frac{360}{40}$ n=9
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