Multiply this by the height (distance between the 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. The formula for the area of a trapezoid is: A = ½ (b 1 + b 2) × h. where b 1 is base 1, b 2 is base 2 and h is height. Example: Area Of A Trapezoid how to find the area of a trapezoid To find the area of a trapezoid, we need to have the two bases, and height. From there we can plug everything into the formula. AREA OF TRAPEZOID FORMULA Area = (1/2) * (Base 1 + Base 2) * Height We add the two bases, multipl Splitting the trapezoid into two triangles may help us understand the formula. The area of the trapezoid is the sum of the areas of the two triangles. See the image below. Splitting a trapezoid into two triangles may help you understand the formula for its area. The height of the trapezoid is also the height of each of the two triangles. What is the area of a trapezium or trapezoid? In order to find the surface, the formula used in our calculator establish that area equals the sum of the bases time a half, and multiplied by the height. If you don't want to perform the calculation by yourself, just enter the data in the fields and press the button to see the results below. A gives the area of the trapezoid. Find the missing measure. 4. A 5 77 ft 2 5. A 5 39 cm 2 6. A 5 84 in. 2 7. A trapezoid has an area of 294 square yards. Its height is 14 yards and the length of one base is 30 yards.