Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10:
ISBN 13:

Chapter 3 - Section 3.3 - Isosceles Triangles - Exercises - Page 147: 41c



Work Step by Step

m$\angle$ABR=m$\angle$A m$\angle$ABR+m$\angle$A+m$\angle$ARB=180 2m$\angle$A+100=180 m$\angle$A=40$^{\circ}$
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