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108 = 4x . 3x
108 = 12x²
x² = 108/12 = 9
x = 3 cm
p = 4x3 = 12 cm
l = 3x3 = 9 cm
t = 2x3 = 6 cm
>> luas permukaan balok = 2(pl + pt + lt) = 2 (108 + 72 + 54) = 2 x 234 = 468 cm²