a) The area of a circle is given by the formula:
![A=(\pi* d^2)/(4)](https://img.qammunity.org/2023/formulas/mathematics/high-school/1t4s9353ywhrea49t0a780cy2zasex0i7l.png)
Where A is the area, π=3.14 and d is the diameter=8 ft.
By replacing values:
![A=(3.14*(8ft)^2)/(4)=(3.14*64ft^2)/(4)=50.24ft^2](https://img.qammunity.org/2023/formulas/mathematics/high-school/q7lvqx5to78dqev9ir10h4g1wml4kxguz2.png)
b) The circumference of a circle is given by:
![C=\pi* d](https://img.qammunity.org/2023/formulas/mathematics/college/2mcaf4aleyuhdzfh5l0jppoywe6frsxiy7.png)
Where C is the circumference, π=3.14 and d is the diameter=8 ft.
By replacing values:
![C=3.14*8ft=25.12ft](https://img.qammunity.org/2023/formulas/mathematics/high-school/4z21gzep2l6glkjtk2t6z69jdwsejmnhd0.png)