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2s²= 64
s²= 32
s= √32
lp= 6 x s x s
lp= 6 x 32
lp= 192 cm²
8 = s √2
4√2 = s
kemudian, cari permukaan luas persegi = 6s² = 6 (4√2)² = 6 x 32 = 192 cm²