Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 2 - Reasoning and Proof - Get Ready! - Page 79: 17


$\angle ADB$

Work Step by Step

From the Angle Addition Postulate, the angle formed by the noncommon sides of adjacent angles has the same measure as the sum of the adjacent angles. In the given example, $\overline{DC}$ is the common side, so $\overline{DA}$ and $\overline{DB}$ are the sides of the straight angle $\angle ADB$.
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