Answer
$l\parallel m
Work Step by Step
The Converse of the Alternate Interior Angles Theorem tells us that if $\angle5\cong\angle 10$, then $l\parallel m$ because these angles are on opposite of the transversal and are between lines l and m.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 3 - Parallel and Perpendicular Lines - 3-3 Proving Lines Parallel - Practice and Problem-Solving Exercises - Page 161: 26
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