Correct. In the circle shown, $\displaystyle{\overline{{{Y}{Z}}}}\usepackage{cmbright}\Huge\$ is a diameter. The diameter is two times the radius. The radius of this circle is 7 inches, so the length of $\displaystyle{\overline{{{Y}{Z}}}}\usepackage{cmbright}\Huge\$ is $\displaystyle{2}{\left({7}\right)}={14}\usepackage{cmbright}\Huge\$ inches.