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 - 3-1 Lines and Angles - Lesson Check - Page 143: 10

Answer

Carly is correct.

Work Step by Step

$\overline{AB}$ and $\overline{HG}$ both lie on the plane that is diagonal through the cube. Since the lines do not intersect and are coplanar, they are parallel.
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