Given Data:
The radius of the circle is r=9 ft.
The side of the square will be twice the radius of the circle, i.e.a=18 ft.
The area of the shaded region can be determined by substracting the area of circle from the area of square,
[tex]\begin{gathered} A=A_s-A_c \\ =(18ft)^2-(\pi(9ft)^2) \\ =69.53ft^2 \end{gathered}[/tex]
Thus, the requried shade area is 69.53 square foot.
