Some types of quadrilaterals don't have parallel sides. Such as a diamond or a kite.
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A square is a four-sided polygon with two congruent parallel sides.
A four-sided polygon with opposite sides parallel and all sides congruent is a square.
NO!!!! A parallelogram is a polygon of four sides. The opposite sides are parallel and equal in length.
That would have to be a trapezoid
General term for a polygon with 4 sides is a quadrilateral. A parallelogram is the special case with two pairs of parallel sides.