## trapezoid

trapezoid, closed plane figure bounded by four line segments, or sides, two of which are parallel and two of which are nonparallel. The parallel sides of a trapezoid are called bases and the nonparallel sides legs; in an isosceles trapezoid the legs are of equal length. The median of a trapezoid is the line segment connecting the midpoints of the legs; it is parallel to the bases and equal to half the sum of their lengths. The altitude of a trapezoid is the perpendicular distance between the bases. The area of a trapezoid is equal to half the product of the altitude and the sum of the bases, i.e., to the product of the altitude and the median.

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"trapezoid." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 24 May. 2017 <http://www.encyclopedia.com>.

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## trapezoid

trap·e·zoid / ˈtrapiˌzoid/ • n. 1. Geom. a type of quadrilateral: ∎ N. Amer. a quadrilateral with only one pair of parallel sides. ∎ Brit. a quadrilateral with no sides parallel. Compare with trapezium. 2. (also trapezoid bone) Anat. a small carpal bone in the base of the hand, articulating with the metacarpal of the index finger. DERIVATIVES: trap·e·zoi·dal / ˌtrapiˈzoidl/ adj.

trapezoid

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"trapezoid." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 24 May. 2017 <http://www.encyclopedia.com>.

"trapezoid." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (May 24, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/trapezoid-0

"trapezoid." The Oxford Pocket Dictionary of Current English. . Retrieved May 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/trapezoid-0

## trapezoid

trapezoidavoid, Boyd, Coed, droid, Floyd, Freud, Lloyd, overjoyed, self-employed, unalloyed, underemployed, unemployed, void •geoid • amoeboid (US ameboid) •globoid • cuboid • gadoid • typhoid •fungoid • discoid • tabloid • colloid •celluloid • mongoloid • alkaloid •coralloid • crystalloid • prismoid •arachnoid • sphenoid • hominoid •crinoid, echinoid •solenoid • humanoid • paranoid •hypoid • anthropoid • gabbroid •android • steroid • thyroid • hydroid •spheroid • meteoroid • Murgatroyd •Polaroid •haemorrhoid (US hemorrhoid) •asteroid • schizoid • factoid • mastoid •deltoid • planetoid • ovoid • trapezoid •rhizoid

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"trapezoid." Oxford Dictionary of Rhymes. . Encyclopedia.com. 24 May. 2017 <http://www.encyclopedia.com>.

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"trapezoid." Oxford Dictionary of Rhymes. . Retrieved May 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/trapezoid