Answer
$\angle$AOB and $\angle$BOC
$\angle$AOD and $\angle$DOC
Work Step by Step
These angles are supplementary because together they form straight lines.
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 8 - Geometry - Review Exercises - Page 614: 13
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