Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 2 - Review Exercises - Page 123: 18

Answer

m$\angle$B=110$^{\circ}$

Work Step by Step

m$\angle$D+m$\angle$C=180 5x+10+5y+20=180 5y=150-5x y=30-x m$\angle$A=m$\angle$C 3x+y=5y+20 3x+(30-x)=5(30-x)+20 2x+30=150-5x+20 7x=140 x=20 y=30-x y=30-20 y=10 m$\angle$B=m$\angle$D m$\angle$B=5x+10 m$\angle$B=5(20)+10 m$\angle$B=110$^{\circ}$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.