Geometry: Common Core (15th Edition)

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

Chapter 1 - Tools of Geometry - 1-5 Exploring Angle Pairs - Practice and Problem-Solving Exercises - Page 39: 33


$m\angle ACD=90$

Work Step by Step

Use the definition of a linear pair, given that $\angle FCA$ is a right angle: $m\angle FCA+m\angle ACD=180$ $90+m\angle ACD=180$ Subtract 90 from each side. $90+m\angle ACD-90=180-90$ $m\angle ACD=90$
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