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: 21

Answer

$\angle ADE\text{ and }\angle EDF\text{ are supplementary.}$

Work Step by Step

$\text{Supplementary}$ angles are two angles whose sum is $180^{\circ}$. Since $\angle ADE\text{ and }\angle EDF$ are adjacent and form a straight ($180°$) angle, they fit this definition, and we can consider them to be $\text{supplementary}$.
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