Area of a trapezoid
Use area = (a + b)/2 * h to find the area of a trapezoid from its two parallel sides and its height. Unlimited questions, five difficulty levels, and a full worked solution every time, included free with weekly lessons.
Try one
A trapezoid-shaped skateboard ramp side panel has parallel sides of 10 cm and 8 cm, and a height of 9 cm. What is its area?
Answer: 81
See one solved, step by step
A trapezoid-shaped garden bed has parallel sides of 14 cm and 14 cm, and a height of 8 cm. What is its area?
📘 Worked solution
1A = (a + b)/2 · h = (14 + 14)/2 · 8The area of a trapezoid is the average of its two parallel sides, times its height.
2= (282) · 8 = 14 · 8Add the parallel sides and divide by 2 to get their average length.
3= 112 cm2Multiply the average side length by the height to get the area.
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