Answer
$m\angle ACD=90$
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.
$90+m\angle ACD-90=180-90$
$m\angle ACD=90$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
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
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