Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 2 - Section 2.4 - The Angles of a Triangle - Exercises - Page 93: 20



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
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