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there are 2 sets of parallel lines in a square
A square has four sets of parallel lines.
There are no parallel lines in a triangle !
A square or rectangle has two sets of parallel lines. Stop signs technically have 4 short sets o parallel lines. Hexagon could have 3 sets, etc. All of which are polygons, though not all polygons have parallel lines.
You can't... A rectangle is defined by 2 sets of parallel lines, ans a parallelogram has 1+ sets of parallel lines