quadrilateral
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any geometric figure which has four sides
A closed geometric figure with four sides, each side being a straight line
A square and a rhombus both have all sides equal and opposite sides parallel.
NO!!!! The word 'polygon' means a planar figure of any number of sides. A parallelogram is a planar figure of four(4) sides.
We don't know what a pentygon is. "Pentagon" means a figure with five sides. Since it has five sides, no pentagon has four sides. A "quadrilateral" has four sides. And pie are square.