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=5/8 x 356 = 222,5 jadi luas persegi terbsar adlh 569,6 cm²
maaf kalau salah smoga dpat mmbantu
La : Lb = Sa² + Sb²
La + Lb = 356
Sa² + Sb² = 356
(8x)² + (5x)² = 356
64x² + 25x² = 356
89x² = 356
x² = 356/89 =4
x=√4= 2
Lb(luas besar) = Sb² =( 8x)² = 64x²
= 64 (2)²
=256 cm²