Geometry: Common Core (15th Edition)

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

Chapter 1 - Tools of Geometry - Chapter Review - Page 73: 20


$\angle ADB\text{ and }\angle BDC\text{ are complementary.}$

Work Step by Step

$\text{Complementary}$ angles are two angles whose sum is $90^{\circ}$. Since $\angle ADB\text{ and }\angle BDC$ are adjacent and form a right angle, they fit this definition, and we can consider them to be $\text{complementary}$.
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