Answer
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.
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
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
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