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270 derajat (terbesar)
9 jam + 30 menit = 9 jam + (30/60) jam
[ 9 x 30°] + [ (30/60) x 30° ]
270° + 15° = 285°
jarum jam panjang bergerak 30 menit, maka 30 x 6 = 180°
sehingga, sudut terkecilnya 285° - 180° = 105° .