Parallel
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Coplanar lines that do not intersect are called parallel lines.
They are called perpendicular lines that intersect each other at right angles.
"skew" lines
If the two lines lie in the same plane, and they do not intersect, then they are parallel. If they are not in the same plane, and do not intersect, then they are called skew lines.
Perpendicular lines intersect to form right angles