Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 3 - Parallel and Perpendicular Lines - 3-2 Properties of Parallel Lines - Apply What You've Learned - Page 155: h

Answer

$\angle12$

Work Step by Step

$\angle 12$ and the angle marked $17^o$ are alternate interior angles. Theorem 3.1 says that alternate interior angles are congruent.
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