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A Quadrilateral with two sides Parallel. The trapezoid depicted above satisfies

m={\textstyle{1\over 2}}(a+b)

and has Area

A={\textstyle{1\over 2}}(a+b)h=mh.

The trapezoid is equivalent to the British definition of Trapezium.

See also Pyramidal Frustum, Trapezium


Beyer, W. H. (Ed.) CRC Standard Mathematical Tables, 28th ed. Boca Raton, FL: CRC Press, p. 123, 1987.

© 1996-9 Eric W. Weisstein