Line A is skew to Line B, when line A does not intersect line B and also they are not in the same plane.
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Skew line segments are lines in space which never intersect.
None of them
there are infinitely many segments in a line.
Perpendicular line segments are line segments that cross with each other and form angles of 90 degrees.
That is a line segment that is "skewed up". It doesn't work right. It gets tossed in the heap that becomes other / lesser polygons and such and may even become a dreaded "circle".