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{{{0.5}\ \text{ ft}}}{{{6}\ \text{ in}}}=\frac{{{6}\ \text{ in}}}{{{6}\ \text{ in}}}={1}\usepackage{cmbright}\Huge\$

For Circle II, 7 feet = 84 inches, so: $\displaystyle{84}\ \text{ in}={r}\cdot{3.5}\Rightarrow{r}=\frac{{{84}\ \text{ in}}}{{{3.5}}}={24}\ \text{ in}\usepackage{cmbright}\Huge\$

For Circle III: $\displaystyle{s}={48}\ \text{ in}\cdot{2.5}={120}\ \text{ in}={10}\ \text{ ft}\usepackage{cmbright}\Huge\$