Since the diameter is 14ft, we can easily see that the radius is:
[tex]r=\frac{d}{2}=\frac{14}{2}=7ft[/tex]
then, we can find the area with the following formula:
[tex]A=\pi\cdot r^2[/tex]
in this case, we have the following:
[tex]\begin{gathered} A=(3.14)\cdot(7)^2=3.14\cdot49=153.86 \\ \Rightarrow A=153.86ft^2 \end{gathered}[/tex]
thus, the area of the circle with diameter 14ft is 153.86ft^2
