Answer
9 sides
Work Step by Step
n=$\frac{S+360}{180}$
n=$\frac{1260+360}{180}$
n=9
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 2 - Section 2.5 - Convex Polygons - Exercises - Page 105: 13b
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