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: 8

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.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.