Area of a Trapezoid
A trapezoid is a four-sided polygon with only one pair of parallel sides. A parallelogram is a type of trapezoid that has two pairs of parallel sides.
Area of a Trapezoid Formula
where a is the top base, b is the bottom base, and h is the height of the trapezoid. Note that is the average length of the top and the bottom and that if a=b, the area becomes a*h, which is the area of a parallelogram.
If a trapezoid has a base of length 4, top of length 6, and height of 2, for example, the area is