Answer
6 sides
Work Step by Step
c=$\frac{360}{n}$
I=$\frac{180(n-2)}{n}$
I=c+60
$\frac{180(n-2)}{n}$=$\frac{360}{n}$+60
180n-360=360+60n
120n=720
n=6
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 7 - Section 7.3 - More about Regular Polygons - Exercises - Page 333: 25
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