Answer
See the picture below:
Work Step by Step
Given: $\angle 1$ and $\angle 2$ are complementary. ($\angle 1+ \angle 2=90^{\circ}$)
$\angle 1$ and $\angle 3$ are complementary. ($\angle 1+ \angle 3=90^{\circ}$)
Prove: $\angle 2\cong \angle 3$
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 1 - Section 1.7 - The Formal Proof of a Theorem - Exercises - Page 53: 13
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