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Find the area of a trapezoid with bases 3 and 9 and height 5.

25

30

Area of a trapezoid is found by multiplying the height by the average of its two bases. With bases 3 and 9, the average is (3+9)/2 = 6. Multiply by the height 5 to get 6×5 = 30. So the area is 30.

Common slips come from using only one base (9×5 = 45 or 3×5 = 15) or miscomputing the base average, but the correct method always uses the average of both bases.

45

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