Correct. In the area formula, the variables l and w take the place of x and z in $\displaystyle{y}={k}{x}{z}\usepackage{cmbright}\Huge\$ . Because $\displaystyle{A}={1}\cdot{l}{w}\usepackage{cmbright}\Huge\$ , the constant $\displaystyle{k}={1}\usepackage{cmbright}\Huge\$ .