$\displaystyle\Delta{A}{B}{C}\usepackage{cmbright}\Huge\$ is not similar to $\displaystyle\Delta{D}{E}{F}\usepackage{cmbright}\Huge\$ , because $\displaystyle{12}-{8}={4}\usepackage{cmbright}\Huge\$ , while $\displaystyle{9}-{6}={3}\usepackage{cmbright}\Huge\$ .