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 - Lesson Check - Page 160: 6


The correct conclusion is $\overset\longleftrightarrow{BC}\parallel\overset\longleftrightarrow{AD}$

Work Step by Step

$\overset\longleftrightarrow{DC}$ is the transversal with the marked angles, so the Converse Same-side Interior Angles Theorem tells us the two lines intersected by $\overset\longleftrightarrow{DC}$ are paallel.
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