Answer
$\angle 1$, $\angle2$
Work Step by Step
Vertical angles are opposite each other when two lines intersect.
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 - Get Ready! - Page 137: 3
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