Trapezoid

From Simple English Wikipedia, the free encyclopedia
Trapezoid.svg

A trapezoid (in North America) or trapezium (in Britain and elsewhere) is a quadrilateral, which is defined as a shape with four sides. This shape has two parallel sides which are called the bases of the trapezoid, and another two sides called its legs. In North America, the term "trapezium" is used for what is elsewhere called an irregular quadrilateral, which has no parallel sides[1].

Special cases[change | change source]

Some trapezoids are special cases where they have at least one noteworthy feature:

  • Iscoceles trapezoids: These have legs that are of the same length, and because of that, this trapezoid has a pair of angles of the same wideness (congruent).

Calculating area[change | change source]

To calculate the area of a trapezoid, you must add the two parallel sides together, divide that by 2, then times that by its height.

Other websites[change | change source]

References[change | change source]

  1. "1913 American definition of trapezium". Merriam-Webster Online Dictionary. Retrieved 2007-12-10.