You may have found only k, the constant of variation. Be sure to complete the problem by substituting $\displaystyle{k}={3.14}\usepackage{cmbright}\Huge\$ , $\displaystyle{r}={3}\usepackage{cmbright}\Huge\$ , and $\displaystyle{h}={9}\usepackage{cmbright}\Huge\$ in the equation $\displaystyle{V}={k}{{r}}^{{2}}{h}\usepackage{cmbright}\Huge\$ .