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= √2s²
√2s² = √72
2s² = 72
s² = 72 / 2
s² = 36
s = 6 cm
luas kubus = 6s²
= 6 * 6 * 6
= 216 cm²
= 6 √2
Luas kubus=6s²
= 6.6²
= 6.36
=216