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.
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Trapezoid
a rectangle is a shape that has two sets of parallel lines a trapezoid only has to have one set of parallel lines
Trapezium.
A trapezoid has two parallel lines.
Any shape that contains a section of a plane can have an infinite number of parallel lines in it.