(1)180°-369°54〃=? (2) 56.6°+72°42′= (도, 분, 초로 표현된 결과) (3) 110°36′-90.82°= (결과

1°=60′ 1'=60''

180°-369°54″=-(369°54″-180°) =-189°54″< /p>

56.6°+72°42′=56.6°+(72+42/60)°=129.3°

=(129.3*60)'=7785'

110°36′-90.82°=(1136/60)°-90.82°=19.78°