Answer
$\angle ADC$ and $\angle BDC$ are a linear pair.
Work Step by Step
A linear pair is two adjacent angles whose noncommon sides are opposite rays.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 2 - Reasoning and Proof - Get Ready! - Page 79: 15
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