The formula to find the area of a circle is
[tex]\begin{gathered} A=\pi r^2 \\ \text{ Where A is the area and} \\ r\text{ is the radius of the circle} \end{gathered}[/tex]So, in this case, you have
[tex]\begin{gathered} r=7ft \\ \text{ Because} \\ \text{ radius }=\frac{\text{ diameter}}{2} \\ \text{ radius }=\frac{14ft}{2} \\ \text{ radius }=7ft \end{gathered}[/tex]Then,
[tex]\begin{gathered} A=\pi r^2 \\ A=\pi(7ft)^2 \\ A=\pi\cdot49ft^2 \\ A=49\pi ft^2 \end{gathered}[/tex]Therefore, the area of this circle in terms of pi is 49 square feet.