Answer
$\angle A$ and $\angle B$ are supplementary.
Work Step by Step
In a parallelogram, consecutive angles are supplementary.
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 4 - Test - Page 207: 1b
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