## Elementary Geometry for College Students (6th Edition)

It is an acute angle with a measure less than 50$^{\circ}$.
If the sum of angles 1 and 2 is more than 130$^{\circ}$ and the sum of all 3 angles is 180$^{\circ}$, then angle 3 must have a measure less than 50$^{\circ}$. Any angle less than 90$^{\circ}$ is acute so angle 3 is also an acute angle.