Answer
x=120$^{\circ}$
Work Step by Step
Angles 3 and 5 are same side interior angles so they are supplementary.
m$\angle$3+m$\angle$5=180
$\frac{x}{2}$+x=180
x+2x=360
3x=360
x=120
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 2.3 - Proving Lines Parallel - Exercises - Page 92: 25
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