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diagonal ruang = s√3
8 = s√3
s = 8 : √3
s = (8√3)/3
Luas permukaan kubus = 6 x s²
Luas permukaan kubus = 6 x {(8√3)/3}²
Luas permukaan kubus = 6 x (64/3)
Luas permukaan kubus = 128 cm²