Answer
$\angle A$ and $\angle B$ are supplementary.
Work Step by Step
In a parallelogram, consecutive angles are supplementary.
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 4 - Test - Page 218: 1b
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