Answer
Lines BC and AD are parallel as well as lines AB and CD.
Work Step by Step
If angle 1 and angle 2 are congruent, that makes them alternate interior angles for both of these pairs of parallel lines.
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 2 - Review Exercises - Page 123: 1b
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