Pronunciation: /ˈtræ pəˌzɔɪd/ Explain

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Manipulative 1: Trapezoid or Trapezium. Created with GeoGebra.

A trapezoid (in American English) or trapezium (in British English) is a four sided quadrilateral where one pair of opposite sides are parallel.[1][2] The parallel sides are called bases. The other two sides are called legs. The word 'trapezoid' is used in U.S. English. The word 'trapezium' is used in U.K. English. The two words mean the same thing.


  1. Hilbert, David. The Foundations of Geometry. pg 28. Translated by Townsend, E. J., Ph. D.. The Open Court Publishing Company. 1950. Last Accessed 12/21/2009.
  2. Stöcker, K.H.. The Elements of Constructive Geometry, Inductively Presented. pp 23, 36-38. Translated by Noetling, William A.M, C.E.. Silver, Burdett & Company. 1897. Last Accessed 12/31/2009. Buy the book
  3. Keller, Samuel Smith. Mathematics for Engineering Students, Plane and Solid Geometry. pg 45. D. Van Nostrand Company. 1908. Last Accessed 1/2/2010. Buy the book

Cite this article as:

McAdams, David E. Trapezoid. 5/5/2011. All Math Words Encyclopedia. Life is a Story Problem LLC.

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Revision History

12/31/2009: Added "References". (McAdams, David E.)
9/17/2009: Initial version. (McAdams, David E.)

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