Elementary Geometry for College Students (5th Edition)

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

Chapter 2 - Section 2.2 - Indirect Proof - Exercises - Page 85: 25

Answer

1. If and only if alternate interior angles are congruent, the lines are parallel. 2. Thus, is alternate interior angles are not congruent, then the line is not parallel.

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