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# What is a parallelogram?

A parallelogram: .
is a quadrilateral (a four sided polygon) .
has opposite sides parallel and of equal length .
has opposite angles equal The area of a parallelogram …is calculated by multiplying one sidelength by the perpendicular distance between that side and the sideparallel to it. A rectangle is a special parallelogram in that all four angles areequal and are right angles (90Â°). A rhombus is a special parallelogram in that all four sides are ofequal length. A square is a special parallelogram in that all four angles areequal (and are right angles) and all four sides are equal inlength. (MORE)