Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 6 - Review Exercises - Page 315: 23a



Work Step by Step

We first find the measure of the arc corresponding to the angle: $ = 75^{\circ} \times 2 = 150^{\circ}$ Thus: $CD= 150 - 80 = 70^{\circ}$
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