Non-parallel lines intersect at some point, parallel lines don't.
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A perpendicular line is a line that creates two 90 degree angles at the line, segment, etc. that it intersects. Parallel lines are two lines that never intersect. Perpendicular lines cross at right angles (+) Parallel lines will never meet, no matter how far they are extended (=)
If two lines are parallel then the area of the plane between them is symmetrical about its centre-line (parallel to and mid-way between the boundary lines).
They are both 4 sided quadrilaterals but a trapezoid has only 1 pair of parallel line of different lengths whereas a parallelogram has 2 pairs of parallel lines
parallel lines - they are parallel when the distance between them remains constant
Any line that is not parallel to the given lines. The transversal that contains the shortest distance between the two parallel lines, is perpendicular to them.