## Thinking Mathematically (6th Edition)

107.8 $m^{2}$
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 $m^{2}$