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: 13c


$m\angle A=36^{\circ}$

Work Step by Step

The measure of an inscribed angle is half the measure of its intercepted arc. We know the measure of arc $BC=72^{\circ}$, so the measure of the angle must be half of that. Or... $m\angle A=36^{\circ}$
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