# Trapezoid

A trapezoid is a quadrilateral with exactly one set of parallel sides

### Isosceles trapezoid

If the nonparallel sides of a trapezoid are the same length, the trapezoid is called an isosceles trapezoid. The trapezoid shown below is an isosceles trapezoid.

See also quadrilateral.

Related words trapeze, trapezium, trapezoidal.