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 - 3-3 Proving Lines Parallel - Practice and Problem-Solving Exercises: 20

Answer

No lines can be determined to be parallel.

Work Step by Step

Angles 9 and 12 are vertical angles, so none of the theorems related to transversals and parallel lines apply.
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