Answer
m$\angle$B=35$^{\circ}$
Work Step by Step
AC=2m$\angle$D
AC=2(40)=80
AD=360-80-130
AD=150
m$\angle$B=.5(AD-AC)
m$\angle$B=.5(150-80)
m$\angle$B=35$^{\circ}$
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: 8
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