Any polygon with four or more sides can have parallel sides.
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A 25-sided shape would have no parallel sides !
If it has four equal sides, then two parallel sides implies two PAIRS of parallel sides. The shape is a rhombus.
A geometric shape with only one set of parallel sides is a trapezoid.
shape no pairs of perpendicular sides
If the shape (a quadrilateral) has only 2 parallel sides, it is a trapezoid (UK trapezium).A shape with four sides and two sets of parallel sides is a parallelogram (rectangle, square, rhomboid, rhombus) because these figures have four sides and two sets of parallel sides.