## Trigonometry (10th Edition)

72$^{\circ}$ 47'
1. Redistribute one degree from the 90 degrees, and change it to 60 minutes. 89$^{\circ}$60'-17$^{\circ}$13' = ? 2. Subtract degrees from degrees and minutes from minutes 89$^{\circ}$ - 17$^{\circ}$ = 72$^{\circ}$ 60'-13' = 47' Answer : 89$^{\circ}$60'-17$^{\circ}$13' = 72$^{\circ}$47'