Answer
A: Always True
Work Step by Step
Corollary 4.1.5: Two consecutive angles of a parallelogram 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 - Review Exercises - Page 217: 7
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