The radius of the circle is 3 inches. Substitute $\displaystyle{r}={3}\usepackage{cmbright}\Huge\$ in the formula:

$\displaystyle{A}=\pi{{r}}^{{2}}\usepackage{cmbright}\Huge\$

$\displaystyle{A}=\pi\cdot{{3}}^{{2}}\usepackage{cmbright}\Huge\$

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

The area of the circle is $\displaystyle{9}\pi\usepackage{cmbright}\Huge\$ square inches.