Correct. For each row, use the formula $\displaystyle{s}={r}\theta\usepackage{cmbright}\Huge\$ for arc length, or the formula $\displaystyle\theta=\frac{{s}}{{r}}\usepackage{cmbright}\Huge\$ for the radian measure of a central angle.

For Circle I: $\displaystyle\theta=\frac{{s}}{{r}}=\frac{{{2}\ \text{ ft}}}{{{6}\ \text{ in}}}=\frac{{{24}\ \text{ in}}}{{{6}\ \text{ in}}}={4}\usepackage{cmbright}\Huge\$

For Circle II, 3 feet = 36 inches, so: $\displaystyle{36}\ \text{ in}={r}\cdot{0.5}\Rightarrow{r}=\frac{{{36}\ \text{ in}}}{{0.5}}={72}\ \text{ in}\usepackage{cmbright}\Huge\$

For Circle III: $\displaystyle{s}={8}\ \text{ in}\cdot{1.5}={12}\ \text{ in}={1}\ \text{ ft}\usepackage{cmbright}\Huge\$