Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 7 - Section 7.3 - More about Regular Polygons - Exercises - Page 344: 21a

Answer

140$^{\circ}$

Work Step by Step

n=$\frac{360}{40}$ n=9 I=$\frac{180(9-2)}{9}$ I=20(7) I=140$^{\circ}$
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