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L = s²
= 9√2²
= 81√4
= 162 cm²
√2s² = 18
√2s² = √324
2s² = 324
s² = 324 / 2
s² = 162
s = √162
s = √81.√2
s = 9√2
luas persegi = s²
= (9√2)²
= 81.2
= 162 cm²