Answer
Coplanar is included to make the definition precise.
Work Step by Step
Skew lines do not intersect but are not coplanar, so specifying that parallel lines are coplanar is necessary to differentiate parallel lines from skew lines.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
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: 8
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