Answer
108 $ft^{2}$
Work Step by Step
We use the formula for the area of a trapezoid to obtain:
A=$\frac{1}{2}$h($b_{1}$+$b_{2}$)
A=$\frac{1}{2}$(9)(6+18)
A=$\frac{1}{2}$(9)(24)
A=108
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