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V= 120 cm³
p = 6 cm
l = 5 cm
maka :
V = p x l x t
120 = 6 x 5 x t
120 = 30 x t
t = 120 / 30
t = 4 cm
jadi tinggi balok = 4 cm
Luas permukaan balok :
L = 2 x (pxl + pxt + lxt)
= 2 x [(6x5) + (6x4) + (5x4)
= 2 x (30 + 24 + 20)
= 2 x 74
= 148 cm²