A Rectangle
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A parallelogram. Opposite sides are parallel and congruent.parallelogram is a quadrilateral with two sets of parallel sides. The opposite sides of a parallelogram are of equal length, and the opposite angles of a parallelogram are congruent. The three-dimensional counterpart of a parallelogram is a parallelepiped.Parallelogram - A quadrilateral whose opposite sides are parallel
A quadrilateral (four sided figure) with opposite sides parallel and equal length see: http://dictionary.die.net/parallelogram
rhombus
A [generic] rectangle is a quadrilateral that has two pairs of opposite sides parallel and equal in length, along with 4 right angles.
quadrilateral