Answer
$m\widehat {ACB}=270^{\circ}$
Work Step by Step
The measure of the whole arc of a circle equals $360^{\circ}$.
Subtract out the known arc...
$360-m\widehat {BC}=m\widehat {ACB}$
$360-90=270$
$m\widehat {ACB}=270^{\circ}$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
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
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
