Not necessarily;
A square, rectangle, rhombus, parallelogram all have some parallel sides, but a kite does not have any.
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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.
Some types of quadrilaterals don't have parallel sides. Such as a diamond or a kite.
That would have to be a trapezoid