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## parallelogram

parallelogram, closed plane figure bounded by four line segments, or sides, with opposite pairs of sides parallel and equal in length. The rhombus, rectangle, and square are special types of parallelograms. Any side of a parallelogram is a base; an altitude is the perpendicular distance from a base to the opposite parallel side. The area of a parallelogram is equal to the product of the lengths of its base and altitude. The diagonals of a parallelogram, connecting opposite vertices, bisect one another; either diagonal divides the parallelogram into two congruent triangles.

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"parallelogram." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

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## parallelogram

parallelogram Quadrilateral (four-sided plane figure) having each pair of opposite sides parallel and equal. Both the opposite angles of a parallelogram are also equal. Its area is the product of one side and its perpendicular distance from the opposite side. A parallelogram with all four sides equal is a rhombus.

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"parallelogram." World Encyclopedia. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

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"parallelogram." World Encyclopedia. . Retrieved December 14, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/parallelogram

## parallelogram

par·al·lel·o·gram / ˌparəˈleləˌgram/ • n. a four-sided plane rectilinear figure with opposite sides parallel.

parallelograms

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"parallelogram." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

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"parallelogram." The Oxford Pocket Dictionary of Current English. . Retrieved December 14, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/parallelogram-0

## parallelogram

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