You may have mistakenly believed that $\displaystyle\angle{Q}{U}{S}\usepackage{cmbright}\Huge\$ measured $\displaystyle{{90}}^{\circ}\usepackage{cmbright}\Huge\$ . The four angles along the straight angle have measures that total $\displaystyle{{180}}^{\circ}\usepackage{cmbright}\Huge\$ . Find the sum of the three given angles and then subtract that sum from $\displaystyle{{180}}^{\circ}\usepackage{cmbright}\Huge\$ .