Area of Trapezoids

The area formula for a trapezoid is found by making a parallelogram made up of two congruent trapezoids. To do this, copy a trapezoid, rotate the copy 180 degrees, and translate to create a parallelogram. The area of a parallelogram is base times corresponding height; since there are two trapezoids, the area of trapezoids formula must be divided in half. Since the bases are not congruent, they must be summed separately.

Videos

$How to derive the area of a trapezoid formula using the area of a rectangle.$
$How to find the length of a base in a triangle where the area, other base, and height are known.$
$How to find the area of a trapezoid given the lengths of the four sides and the height of the trapezoid.$
$How to find the area of a trapezoid where the base lengths, one side, and two angles are given.$