Elementary Geometry for College Students (5th Edition)

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

Chapter 2 - Review Exercises - Page 124: 40

Answer

1. If angle 1 and angle 3 were congruent, then lines m and n would be parallel by the alternate exterior angles theorem, for angles 1 and 3 are alternate exterior angles. 2. However, these two angles are not congruent. 3. Therefore, lines m and n are not parallel.
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