Answer
$\angle A$ and $\angle B$ are supplementary.
Work Step by Step
In a parallelogram, consecutive angles are supplementary.
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 4 - Test - Page 216: 1b
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