Correct. Given $\displaystyle{a}={12}\usepackage{cmbright}\Huge\$ and $\displaystyle{b}={16}\usepackage{cmbright}\Huge\$ , the Pythagorean Theorem shows that $\displaystyle{{c}}^{{2}}={{a}}^{{2}}+{{b}}^{{2}}\usepackage{cmbright}\Huge\$ , so $\displaystyle{c}=\sqrt{{{400}}}={20}\usepackage{cmbright}\Huge\$ .