## Geometry: Common Core (15th Edition)

Published by Prentice Hall

# Chapter 3 - Parallel and Perpendicular Lines - 3-3 Proving Lines Parallel - Practice and Problem-Solving Exercises - Page 161: 21

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#### Work Step by Step

$\angle7$ and $\angle9$ are not created by the same transversal, so the theorem and postulates are not applicable.

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