Answer
arc AC=80$^{\circ}$
Work Step by Step
m$\angle$DAB=180-m$\angle$EAD
m$\angle$DAB=180-70
m$\angle$DAB=110
m$\angle$D=180-30-110
m$\angle$D=40
arc AC=2m$\angle$D
arc AC=80$^{\circ}$
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 - Review Exercises - Page 315: 7
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