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108 = 3x*4x
108 = 12x²
x² = 108/12
x = 3
P = 4*3 = 12
L = 3*3 = 9
T = 2*3 = 6
Permukaan balok = 2PL + 2PT + 2LT
(=) 2(12)(9) + 2(12)(6) + 2(9)(6)
(=) 216 + 144 + 108
(=) 468 cm²