Incorrect. If you know the diameter (d) of a circle, use the formula $\displaystyle{C}=\pi{d}\usepackage{cmbright}\Huge\$ to find the circumference (C). If you know the radius (r) of a circle, use the formula $\displaystyle{C}={2}\pi{r}\usepackage{cmbright}\Huge\$ to find the circumference. Use 3.14 as an approximation for $\displaystyle\pi\usepackage{cmbright}\Huge\$ and round your answer to the nearest whole number.