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Luas permukaan balok = 2 ((p*l) + (p*t) + (l*t))
= 2 ((12*6) + (12*8) + (6*8))
= 2 (72 + 96 + 48)
= 2*216
= 432 cm²
Jadi luas permukaan kotak makan tsb adalah 432 cm²
= (2 . 12 . 6) + (2 . 6 . 8) + (2 . 8 . 12)
= 144 + 96 + 192
= 432 cm²