# What is a Trapezoid

By the end of this lesson, you will be able to

- define trapezoid or trapezium.
- calculate the area of trapezoid or trapezium.

## Trapezoid

A trapezoid (trapezium in UK) is a convex quadrilateral with at least one pair of parallel sides.

A trapezoid showing its height between parallel sides.

Things to know to acquire a clear concept of trapezium or trapezoid because there are two contradictory meanings of trapezium depending on English used in geographical areas:

- Trapezium in UK = Trapezoid in US.
- Irregular Quadrilateral in UK = Trapezium in US.

## Area of Trapezoid

One can find out the area of a trapezoid in sevaral ways.

Let a and b be the lengths of two parallel sides and h the height. Then

Area = 12 (a+b) h square unit