Ebcause you use it in architacture and construction and stuff
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Non-intersecting lines in 3-D space may be parallel but need not be.
It need not have any.
= parallel + perpendicular As such no, perpendicular lines do not naturally have parallel lines. However...connect the lines in the symbols below. ++ ++ And you'll have 4 perpendicular lines, and 4 parallel lines.
No, parallel lines do not intersect, and never will.
In order to describe parallel, you need 2 lines to be parallel to each other. The lines will lie in the same plane, and the right-angle distance between the 2 lines will be constant for the entire length of the lines. Since lines are infinite length in length, they will never intersect.