This is a free lesson from our course in Geometry In this lesson, we will look at the formula used to calculate the area of a trapezoid. You will learn it with the help of some examples and practice questions with solution, and watching video as well as explanations by the instructor. You know from earlier learning that a trapezoid is a 4-sided figure with one pair of parallel sides. To find the area of a trapezoid; take the sum of its bases, multiply the sum by the height of the trapezoid, and then divide the result by 2. (More text below video...)
Other useful lessons:
 Area of a Rectangle Area of a Square Area of a Triangle - Areas of Polygons and Circles Area of a Rhombus Area of a Parallelogram Area of a Circle Effect of dimension changes on Area Real World Applications - Area of Polygons and Circles
(Continued from above) Here the height is the length of segment drawn perpendicular to the base from an opposite vertex. If h is the height and b1 and b2 are bases of a trapezoid, then its area is: 1/2 x height x (Sum of bases) i.e. = 1/2 x h x (b1 + b2). For example, if height of a trapezoid is 8 inches and bases of trapezoid measure 13 and 15 inches, the area is given by = 1/2 x 8 x (13 + 15) which works out to 112 inches2.
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