## Trigonometry (10th Edition)

17$^{\circ}$01'49"
1. Redistribute a degree from the 90 and change it to 60 minutes. Then change one of minutes to 60 seconds. $89^{\circ}59'60"- 72^{\circ}58'11" = ?$ 2. Subtract separately then combine $89^{\circ}-72^{\circ}=17^{\circ}$ $59'-58'=01'$ $60"-11"=49"$ $17^{\circ}01'49"$