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volume balok = p × l × t
4096 = 4a × 2a × a
4096 = 8a³
a³ = 512
a = 8 cm
p = 4a = 32 cm
l = 2a = 16 cm
t = a = 8 cm
luas permukaan balok = 2 (pl + pt + lt) = 2 (512 + 256 + 128) = 1792 cm²