Answer
107.8 $m^{2}$
Work Step by Step
Given h = 7m , a = 20.8 m, and b = 10m
The formula for area of a trapezoid is: $A=1/2h(a+b)$
=$\frac{1}{2}$x 7 x (20.8 + 10 )
=$\frac{1}{2}$x 7 x 30.8
= 107.8 $m^{2}$
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