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60L=960
L=960/60=16
sekarang tinggi...
60m/20cm = 9m/t
9m x 20 cm = 60m x t
900 cm x 20 cm = 6.000cm x t
18.000 cm^ = 6.000 cm x t
t = 18.000 cm^ / 6.000 cm
t = 3 cm
note : ^ = kuadrat