2 parralel lines are lines that are parallel to each other so they are oppoosite to eathother x
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A trapezoid has two parallel lines.
A trapezoid does not has 2 pairs of parallel lines. A parallelogram does.
In 2D geometry, that is the definition of parallel lines. Two non-intersecting lines are indeed parallel.
A square has 2 pairs of opposite parallel lines.
If the 2 lines lie in the same plane, and they are not parallel, then they will intersect at some point. If the 2 lines are skew lines, then they are not in the same plane, and they will not intersect (but they are Not Parallel)