Skew. If they are in the same plane they are called parallel.
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skew lines
Skew lines are non-coplanar, which means they are in different planes. Skew lines are in different planes and they do not intersect.
The lines that cross at a 90 degree angle are called Perpindicular lines.
The location two lines cross or intersect is called a vertex.
Lines that cross each other at 90 degrees are perpendicular lines.