Area of a trapezoidThis lesson will show how we find the area of a trapezoid by using the formula you see below the trapezoid Example #1: If b_{1} = 7 cm, b_{2} = 21 cm, and h = 2 cm, find A (b_{1} + b_{2})/2 = (7 + 21)/2 = 28/2 = 14 A= 14 × 2 = 28 cm Example #2: If b_{1} = 15 cm, b_{2} = 25 cm, and h = 10 cm, find A (b_{1} + b_{2})/2 = (15 + 25)/2 = 40/2 = 20 A= 20 × 10 = 200 cm Example #3: If b_{1} = 9 cm, b_{2} = 15 cm, and h = 2 cm, find A (b_{1} + b_{2})/2 = (9 + 15)/2 = 24/2 = 12 A= 12 × 2 = 24 cm Practice with this calculator Trapezoid calculator Fun math game: Destroy numbered balls by adding to 10
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