Correct. Given the points (1, 2) and (5, -1), the distance between them is $\displaystyle\sqrt{{{{\left({x}_{{1}}-{x}_{{2}}\right)}}^{{2}}+{{\left({y}_{{1}}-{y}_{{2}}\right)}}^{{2}}}}=\sqrt{{{{\left({1}-{5}\right)}}^{{2}}+{{\left({2}-{\left(-{1}\right)}\right)}}^{{2}}}}=\usepackage{cmbright}\Huge\$ $\displaystyle\sqrt{{{{\left(-{4}\right)}}^{{2}}+{{\left({3}\right)}}^{{2}}}}=\sqrt{{{16}+{9}}}=\sqrt{{{25}}}={5}\usepackage{cmbright}\Huge\$ .