# What Is a Trapezoid? (Mathematics Lesson)

# What Is a Trapezoid

A trapezoid is a four sided shape with one pair of opposite parallel sides.# Parts of a Trapezoid

- The parallel sides of a trapezoid are called bases.

- The other sides of a trapezoid are called legs or lateral sides.

# Properties of Trapezoids

- Only one pair of sides of a trapezoid is parallel.

The other pair of sides is not parallel.

# The Area of a Trapezoid

The area of a trapezoid is given by the formula:where b1 and b2 are the lengths of the bases of the trapezoid and h is the height of the trapezoid.

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##### Note

**TRAPEZOID, TRAPEZIUM**

The shape is called a trapezoid in North America.

In English speaking countries outside North America, a trapezoid is called a trapezium.

**WHAT'S IN A NAME?**

Trapezoid and trapezium come from the Greek word 'trapezion' meaning 'little table'.

# A TRAPEZOID IS A POLYGON

A trapezoid is a type of polygon.A polygon is a 2-dimensional shape with straight sides.

A trapezoid is an irregular polygon. Irregular polygons have different length sides and different angles.

# A TRAPEZOID IS A QUADRILATERAL

A trapezoid is a quadrilateral.A trapezoid is a four-sided polygon.

Parallelograms, rectangles and squares are also quadrilaterals.