Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 6 - Review Exercises - Page 306: 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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