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d ruang d² = (s√2)² + s²
d² = 2s² + s² = 3s²
12² = 3s² → 144 = 3s²
s² = 144/3 = 48
s = 4√3 cm
L = 6s² = 6(4√3)² = 6(16*3)
= 288 cm²