a) The area of a circle is given by the formula:
[tex]A=\frac{\pi\times d^2}{4}[/tex]Where A is the area, π=3.14 and d is the diameter=8 ft.
By replacing values:
[tex]A=\frac{3.14\times(8ft)^2}{4}=\frac{3.14\times64ft^2}{4}=50.24ft^2[/tex]b) The circumference of a circle is given by:
[tex]C=\pi\times d[/tex]Where C is the circumference, π=3.14 and d is the diameter=8 ft.
By replacing values:
[tex]C=3.14\times8ft=25.12ft[/tex]