Elementary Geometry for College Students (5th Edition)

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

Chapter 2 - Section 2.3 - Proving Lines Parallel - Exercises - Page 92: 31

Answer

1. Consider two alternate exterior angles A and B. 2. By the vertical angle theorem, angle B is congruent to angle A's corresponding angle. 3. If corresponding angles are congruent, then the lines are parallel. 4. Thus, if the alternate exterior angles are congruent, then the lines are parallel.
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