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6√2 = √3s²
√36.2 = √3s²
√72 = √3s²
3s² = 72
s² = 72 / 3
s² = 24
s = √24
s = √4.√6
s = 2√6 cm
luas permukaan = 6s²
(=) 6(2√6)²
(=) 6(4.6)
(=) 6(24)
(=) 144 cm²