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.
Cite this article
Pick a style below, and copy the text for your bibliography.

MLA

Chicago

APA
"trapezoid." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 16 Dec. 2017 <http://www.encyclopedia.com>.
"trapezoid." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (December 16, 2017). http://www.encyclopedia.com/reference/encyclopediasalmanacstranscriptsandmaps/trapezoid
"trapezoid." The Columbia Encyclopedia, 6th ed.. . Retrieved December 16, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopediasalmanacstranscriptsandmaps/trapezoid
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.
Cite this article
Pick a style below, and copy the text for your bibliography.

MLA

Chicago

APA
"trapezoid." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 16 Dec. 2017 <http://www.encyclopedia.com>.
"trapezoid." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (December 16, 2017). http://www.encyclopedia.com/humanities/dictionariesthesaurusespicturesandpressreleases/trapezoid0
"trapezoid." The Oxford Pocket Dictionary of Current English. . Retrieved December 16, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionariesthesaurusespicturesandpressreleases/trapezoid0
trapezoid
trapezoid
•avoid, Boyd, Coed, droid, Floyd, Freud, Lloyd, overjoyed, selfemployed, 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
Cite this article
Pick a style below, and copy the text for your bibliography.

MLA

Chicago

APA
"trapezoid." Oxford Dictionary of Rhymes. . Encyclopedia.com. 16 Dec. 2017 <http://www.encyclopedia.com>.
"trapezoid." Oxford Dictionary of Rhymes. . Encyclopedia.com. (December 16, 2017). http://www.encyclopedia.com/humanities/dictionariesthesaurusespicturesandpressreleases/trapezoid
"trapezoid." Oxford Dictionary of Rhymes. . Retrieved December 16, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionariesthesaurusespicturesandpressreleases/trapezoid