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1 jam = 60 menit = 4 sudut siku-siku
a) 14.30 - 17.45 itu 3 jam 15 menit
banyak sudut siku-siku = 3x4 + 1= 13
b) 08.20 - 11.20 itu 3 jam
banyak sudut siku-siku= 3x4 = 12