Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 6 - Section 6.1 - Circles and Related Segments and Angles - Exercises - Page 286: 11d


$m\angle 1=80^{\circ}$

Work Step by Step

In part a we determined that the measure of arc $AB=80^{\circ}$. The measure of a central angle is equal to the measure of its intercepted arc. Thus, $m\angle 1=80^{\circ}$.
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