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volume
= 648 liter
= 648.000 cm3
panjang balok
= 648.000 : ( 60 x 90)
= 120
luas sisi balok
= 2 (p.l + p.t + lt)
= 2(120.60 + 120.90 + 60.90)
= 2 . 23400
= 46.800 cm2