Use the calculator on the right to calculate height, base lengths and area of a trapezoid. Enter any three values and the missing one will be calculated.http://www.mathopenref.com/trapezoidarea.html This page describes how to derive the forumula for the area of a trapezoid, by creating a parallelogram from two congruent trapezoids. The equation is then found by ...http://www.mathopenref.com/trapezoidareaderive.html The total space inside the boundary of the trapezoid is called as the area of the trapezoid. Area is measured in terms of square unit. Any quadrilateral figure with ...http://math.tutorvista.com/geometry/area-of-a-trapezoid.html Formula for area of a square, rectangle, circle, parallelogram and triangle. Examples and lessons are included.http://www.mathexpression.com/formula-for-area.html You May Also Like. How to Find the Area of a Trapezoid for Kids. Even kids can get in on the fun of finding the area of an object. Learn how to find the ...http://www.ehow.com/how_2216259_find-area-trapezoid.html Summary: 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 ...http://www.mathgoodies.com/lessons/vol1/area_trapezoid.html Area and Volume Formula for geometrical figures - square, rectangle, triangle, polygon, circle, ellipse, trapezoid, cube, sphere, cylinder and cone.http://www.science.co.il/formula.asp A trapezoid has four sides where two sides are parallel to each other. The height of the trapezoid is perpendicular to the parallel sides.http://www.mathexpression.com/area-of-a-trapezoid.html Math video teaches students how to find the area of a trapezoid.http://www.mathplayground.com/howto_area_trapezoid.html I have used a previous answer from the user Sid to help me understand why the formula of the area of a trapezoid works. I have made a jpg image of the explanation of ...http://www.khanacademy.org/math/geometry/basic-geometry/area_non_standard/v/area-of-a-trapezoid-1#!