Contours can intersect if you have an overhang.
If there is a vertical drop, the contours will touch but not cross one another.
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Coplanar lines that don't intersect are parallel. Lines that are not parallel and do not intersect are skew lines.
no they are straight lines that never intersect, intersecting lines intersect.
Skew lines never intersect. If two lines intersect, then they are known as "intersecting lines", not skew lines.
No. Skew lines do not intersect
Lines that intersect at right angles.