Correct. The diameter of the circle is 6 feet. The radius is half of this. Therefore, substitute $\displaystyle{r}={3}\usepackage{cmbright}\Huge\$ into the formula $\displaystyle{A}=\pi{{r}}^{{2}}\usepackage{cmbright}\Huge\$ to find the area of the circle.

$\displaystyle{A}=\pi{{\left({3}\right)}}^{{2}}\usepackage{cmbright}\Huge\$

$\displaystyle{A}=\pi\cdot{9}\usepackage{cmbright}\Huge\$

$\displaystyle{A}\approx{3.14}\cdot{9}\approx{28.26}\approx{28}\usepackage{cmbright}\Huge\$

The area of the circle is approximately 28 square feet.