## Trigonometry (10th Edition)

$91^{\circ}$
1. Interior angles of triangle add up to 180 degrees $x+52^{\circ}+37^{\circ}=180^{\circ}$ 2. Solve for x to find the angle $x=180^{\circ}-37^{\circ}-52^{\circ}$ $x=91^{\circ}$