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12s = 192
s = 192 / 12
s = 16 cm
Luas permukaan kubus = 6s²
= 6 * 16²
= 6 * 256
= 1.536 cm²
s = 16
Lp = 6 x s x s
Lp = 6 x 16 x 16 = 1.536 cm2