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 - Section 6.1 - Circles and Related Segments and Angles - Exercises - Page 285: 9b


$m\widehat {ACB}=270^{\circ}$

Work Step by Step

The measure of the whole arc of a circle equals $360^{\circ}$. Subtract out the known arc... $360-m\widehat {BC}=m\widehat {ACB}$ $360-90=270$ $m\widehat {ACB}=270^{\circ}$
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