The distance between two points $\displaystyle{\left({x}_{{1}},{y}_{{1}}\right)}\usepackage{cmbright}\Huge\$ and $\displaystyle{\left({x}_{{2}},{y}_{{2}}\right)}\usepackage{cmbright}\Huge\$ is $\displaystyle\sqrt{{{{\left({x}_{{1}}-{x}_{{2}}\right)}}^{{2}}+{{\left({y}_{{1}}-{y}_{{2}}\right)}}^{{2}}}}\usepackage{cmbright}\Huge\$ .

Determine the distance between (1, 2) and (5, -1).