Answer
Always
Work Step by Step
In order for lines to intersect, that have lie within the same plane. Lines in different planes will never cross paths.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 1 - Tools of Geometry - 1-2 Points, Lines, and Planes - Practice and Problem-Solving Exercises - Page 17: 42
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