Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 1 - Section 1.3 - Introduction to Geometric Proof - Exercises - Page 55: 30


1. Given 2. Angle addition Postulate 3. Subtraction property of equality

Work Step by Step

1. Given 2. The sum of the two angles within $\angle$ABC is equal to m$\angle$ABC. 3. Subtract m$\angle$DBC from both sides.
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