Answer
m$\angle$ADB=20$^{\circ}$
Work Step by Step
m$\angle$C=m$\angle$A=70$^{\circ}$
m$\angle$A+m$\angle$ABD+m$\angle$ADB=180
70+90+m$\angle$ADB=180
m$\angle$ADB=20
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 3 - Review Exercises - Page 173: 21
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