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 - Review Exercises - Page 315: 5

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$^{\circ}$
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