Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 1 - Section 1.7 - The Formal Proof of a Theorem - Exercises - Page 56: 30


1. Given 2. Definition 3. Substitution 4. Definition

Work Step by Step

1. Both $\angle 1$ and $\angle 2$ are right angles. 2. By definition $m\angle 1 = 90^{\circ}$, $m\angle 2 =90^{\circ}$ 3. $m\angle1=m\angle2$ 4. If two angles have the same angle measure, they are congruent. Therefore, $\angle1\cong\angle2$.
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