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: 9a

Answer

$m\widehat {AB}=90^{\circ}$

Work Step by Step

The measure of a central angle equals the measure of its central arc. Thus, $m\widehat {BC}=m\angle AOB=90^{\circ}$.
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