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864 = 12 x 9 x t
t = 864/(12 x 9)
t = 8 cm
Luas permukaan = 2(p x l) + 2(p x t) + 2(l x t)
= 2(12 x 9) + 2(12 x 8) + 2(9 x 8)
= 216 + 192 + 144 = 552 cm^2