## Trigonometry (10th Edition)

89$^{\circ}$ in the I quadrant
1. 0-90 degrees in the first quadrant. Therefore 0$^{\circ}$$\leq89^{\circ}$$\leq$90$^{\circ}$ 2. Coterminal angles are always in the same quadrant with original angle, because of full resolutions (2$\pi$) 89° + 360° = 449° 89° - 360° = -271°