www.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/area-trap-composite/v/area-of-a-trapezoid-1

Area of a trapezoid is found with the formula, A=(a+b)/2 x h. Learn how to use the formula to find area of trapezoids.

www.mathgoodies.com/lessons/vol1/area_trapezoid.html

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, The formula for the area ...

www.virtualnerd.com/pre-algebra/perimeter-area-volume/perimeter-and-area/area/trapezoid-area-formula

You could start by creating a parallelogram out of two trapezoids. Then, use the ... half of a parallelogram; trapezoid; area; formula; base 1; base 2; height.

www.virtualnerd.com/pre-algebra/perimeter-area-volume/perimeter-and-area/area-formulas-examples/trapezoid-area-example

In this tutorial, you'll see how to identify those values and plug them into the formula for the area of a trapezoid. Then see how to simplify to get your answer!

www.mathopenref.com/trapezoidarea.html

Area formula. The area of a trapezoid is given by the formula. Area. = h. ·. b. 1. +. b. 2. 2. where b1, b2 are the lengths of each base h is the altitude (height).

www.wikihow.com/Calculate-the-Area-of-a-Trapezoid

How to Calculate the Area of a Trapezoid. A trapezoid (also known as a trapezium in British English) is a quadrilateral with two parallel sides of different lengths.

keisan.casio.com/exec/system/1223273662

Calculates the area of a trapezoid given two parallel sides and the height.

socratic.org/questions/the-formula-for-the-area-of-a-trapezoid-is-a-1-2h-b1-b2-how-do-you-express-b1-in

Apr 21, 2015 ... To express b1 in terms of A ,h and b2 multiply both side of the equation by 2/h to extract it on the right side of the equation then transpose b2.