Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 2 - Section 2.5 - Convex Polygons - Exercises - Page 102: 43b



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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