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A four sided polygon with four congruent sides is a rhombusA square.
A Square. A parallelogram is a four sided figure with two sets of parallelsides. If allthe sides are congruent,the the figure formed is a square.
A rectangle is a quadrilateral with opposite sides parallel and congruent and four right angles. If all four sides are congruent, it is a square.
A four sided figure with no parallel sides is a trapezium, but it is also an irregular four-sided polygon, tetragon, quadrilateral, or quadrangle.
A general quadrilateral is a four sided polygon with no parallel sides and no congruent sides.