# Trapezoid

convex quadrilateral with at least one pair of parallel sides

A trapezoid (in North America) or trapezium (in Britain and elsewhere) is a quadrilateral, which is defined as a shape with four sides, which has one set of parallel sides. In North America, the term "trapezium" is used for what is elsewhere called an irregular quadrilateral.

## Calculating area

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.

${\displaystyle A={\frac {a+b}{2}}\cdot h}$