Answer
m$\angle$ARB=100$^{\circ}$
Work Step by Step
m$\angle$ARB=180-m$\angle$BRT
m$\angle$ARB=180-80
m$\angle$ARB=100$^{\circ}$
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 3 - Section 3.3 - Isosceles Triangles - Exercises - Page 147: 41b
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