trapezoid A quadrilateral with one pair of parallel sides; in Britain this shape is known as a trapezium. If the parallel sides are of length a and b, and h is the perpendicular distance between them, then the area of the trapezoid is given by A = ½ (a + b)h. Related category MATHEMATICS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |