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 - Practice and Problem-Solving Exercises - Page 145: 39

Answer

always

Work Step by Step

By definition, two planes that do not intersect are parallel.
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