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Trapezoids
(KS2, Year 6)
The Lesson
A trapezoid is a four sided shape with one pair of opposite parallel sides.Dictionary Definition
The Oxford English Dictionary defines a rectangle as "a quadrilateral figure having only two sides parallel."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 Perimeter of a Trapezoid
The perimeter of a trapezoid is given by the formula:In this formula, b_{1} and b_{2} are the lengths of the bases of the trapezoid and l_{1} and l_{2} are the lengths of the legs of the trapezoid.
The Area of a Trapezoid
The area of a trapezoid is given by the formula:In this formula, b_{1} and b_{2} are the lengths of the bases of the trapezoid and h is the height of the trapezoid.
Read more about how to find the area of a trapezoid
Interactive Widget
Here is an interactive widget to help you learn about trapezoids.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 2dimensional 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 foursided polygon. Parallelograms, rectangles and squares are also quadrilaterals. Do you disagree with something on this page?
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