Answer
Definition of supplementary angles.
Work Step by Step
The given conclusion can be made using the definition of supplementary angles as proof.
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: 7
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