Answer
130$^{\circ}$
Work Step by Step
m$\angle$B=.5(AD-AC)
50=140-AC
arc AC=90
arc DC=360-AD-AC
arc DC=360-140-90=130$^{\circ}$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 6 - Review Exercises - Page 319: 5
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