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No, they have to be straight. --------------------------- ------------------ Those are parallel lines because they are straight. In geometry, a non-straight line has no meaning. It is allowed that arcs, planes and such can be parallel. In common usage, a twisting and turning line can be described as parallel to another, such as the rails of a railroad track, even though they are not co-planar or straight. It may not be proper by geometric definition but it is descriptive and conveys the meaning adequately.
If L1 is parallel to L2 and L2 is parallel to L3 then L1 is parallel to L3.
A structure that is parallel.
No, never. Parallel lines are line that will NEVER intersect.
Non-parallel lines intersect at some point, parallel lines don't.