Answer
m$\angle$B=x
Work Step by Step
Angles 1 and 5 form a straight line so they are supplementary.
m$\angle$1+m$\angle$5=180
2x+m$\angle$5=180
m$\angle$5=180-2x
m$\angle$3+m$\angle$5+m$\angle$B=180
x+180-2x+m$\angle$B=180
m$\angle$B=x
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 2 - Section 2.4 - The Angles of a Triangle - Exercises - Page 97: 20
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