They are not similar because $\displaystyle{\overline{{{F}{D}}}}\usepackage{cmbright}\Huge\$ is twice as long as $\displaystyle{\overline{{{C}{A}}}}\usepackage{cmbright}\Huge\$ , $\displaystyle{\overline{{{E}{D}}}}\usepackage{cmbright}\Huge\$ is twice as long as $\displaystyle{\overline{{{B}{A}}}}\usepackage{cmbright}\Huge\$ , and $\displaystyle{\overline{{{F}{E}}}}\usepackage{cmbright}\Huge\$ is twice as long as $\displaystyle{\overline{{{C}{B}}}}\usepackage{cmbright}\Huge\$ .