#### Answer

26 $ft^{2}$

#### Work Step by Step

You first need to determine the height of the trapezoid. To do this first find the length of the base of the triangle.
8-5=3
Then, use the Pythagorean Theorem to find the height.
$a^{2}$+$b^{2}$=$c^{2}$
$3^{2}$+$b^{2}$=$5^{2}$
9+$b^{2}$=25
$b^{2}$=16
b=4
The formula for the area of a trapezoid is A=$\frac{1}{2}$h$(b_{1}$ +$b_{2}$)
A=$\frac{1}{2}$(4)(5+8)
A=$\frac{1}{2}$4(13)
A=26