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Properties of a trapezoid

A trapezoid is a quadrilateral with one pair of parallel sides.

The parallel sides of a trapezoid create the bases.

The sum of the interior angles of a trapezoid equals 360 degrees, and the angles on each side of the trapezoid are supplementary.

A trapezoid has four vertices, also called corners.

The median of a trapezoid is a line that connects the midpoint of the two legs.

The formula for finding the median is to add base 1 plus base 2, and divide by two.

In addition there are right trapezoids and an isosceles trapezoid.

A right trapezoid has a right angle.

An isosceles trapezoid is a trapezoid with two parallel sides, and the two other sides are congruent.

In addition the diagonals of an isosceles triangle are congruent.

The base angles of an isosceles trapezoid are congruent.

In the UK a trapezoid is called a trapezium

The formula for finding area is 1/2 (base 1 + base 2) times the height

The formula for perimeter is base 1 + base 2 + side 1 + side2

A common mistake made by people is using the side length as the height. It is not.

The height is a line drawn perpendicular to the base.

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