Explanation:
make the figure into 1 rectangle with dimensions 25 and w,and rite triangle with hypotenuse = 18 and h = 8
applying Pythagoras theorem
18^2 = 8^2 + b^2
b^2 = 260
b = 2√65ft
area of rectangle = 2√65 * 25= 50√65
area of triangle = 1/2 * 2√65*8 = 8√65
total area = 58√65 ft^2