## Trigonometry (10th Edition)

8440 $^{\circ}$ is a big number compared to 360$^{\circ}$. The best way to find its coterminal angle is to divide initial angle by 360 $^{\circ}$, and find how many times 360 should be subtracted. 8440° ÷360° = 23 $\frac{4}{9}$ 8440° - (360° × 23) = 160°