Answer:
a) area of the semicircle (As)
[tex]A_{s}=\pi r^{2}\\r=x/2\\A_{s}=\pi (x/2)^{2}\\A_{s}=\pi x^{2}/4[/tex]
b) Shaded area (Ash) is the area of the semicircle minus the area of the circle in the center
[tex]A_{sh}=8\pi*x^{2}-\pi y^{2}[/tex]
c) Area of the garden
[tex]A_{sh}=8\pi (6)^{2}-\pi (0.5)^{2} = 903.99 = 904 m^{2}[/tex]
