The figure is made up of a triangle and a semicircle.
The triangle has base 3.6 ft and height 4.8 ft.
The semicircle has diameter 3.6 ft, so its radius is 1.8 ft.
The total area is the area of the triangle plus the area of the semicircle.
A = bh/2 + pi * r^2/2
A = (3.6 ft) * (4.8 ft)/2 + 3.14 * (1.8 ft)^2 / 2
A = 8.64 ft^2 + 5.0868 ft^2
A = 13.7 ft^2