Answer
Definition of supplementary angles
Work Step by Step
The definition of supplementary angles can be used to justify the given conclusion.
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 1.5 - Introduction to Geometric Proof - Exercises - Page 44: 8
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