Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10:
ISBN 13:

Chapter 3 - Review Exercises - Page 166: 21



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
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