The formula for the area of a trapezoid is given by
A = 1/2 (b1+b2) *h where b1 and b2 are the lengths of the bases and h is the height
= 1/2 ( 3+7) * 5
= 1/2 ( 10) * 5
= 1/2 (50)
= 25 cm^2
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