High Quality Content by WIKIPEDIA articles! In geometry, a four-sided figure with one pair of parallel sides is referred to as trapezoid in American English and as a trapezium in British English. A trapezoid with vertices ABCD is denoted Trapezoidn.PNG ABCD or ABCD.This article uses the term trapezoid in the sense that is current in the USA and some other English-speaking countries. Readers in the UK should read trapezium for each use of trapezoid in the following paragraphs.There is also some disagreement on the allowed number of parallel sides in a trapezoid. At issue is whether parallelograms, which have two pairs of parallel sides, should be counted as trapezoids. Some authors define a trapezoid as a quadrilateral having exactly one pair of parallel sides, thereby excluding parallelograms. Other authors define a trapezoid as a quadrilateral with at least one pair of parallel sides, making a parallelogram a special type of trapezoid.

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