Answer
90$^{\circ}$
Work Step by Step
I=$\frac{(n-2)\times180}{n}$
I=$\frac{(4-2)\times180}{4}$
I=$\frac{(2)\times180}{4}$
I=90$^{\circ}$
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: 9a
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