Answer
$\overline{AB}$ and $\overline{CD}$ are parallel.
Work Step by Step
Refer to the given picture to observe that the two lines are parallel.
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 2 - Section 2.2 - Indirect Proof - Exercises - Page 81: 21
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