Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 1 - Section 1.5 - Introduction to Geometric Proof - Exercises - Page 45: 30

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.
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