Answer
70$^{\circ}$
Work Step by Step
We first find the measure of the arc corresponding to the angle:
$ = 75^{\circ} \times 2 = 150^{\circ}$
Thus:
$CD= 150 - 80 = 70^{\circ}$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 6 - Review Exercises - Page 315: 23a
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