Perhaps you overlooked the horizontal ray and found the angle that the other ray would make with a vertical line. The protractor is aligned with the ray on the right at $\displaystyle{{0}}^{\circ}\usepackage{cmbright}\Huge\$ . Because $\displaystyle{{0}}^{\circ}\usepackage{cmbright}\Huge\$ is on the inside, the inside number to which the other ray is pointing will be the angle measure.