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= (3 × (panjang × tinggi)) + (2 × sisi²)
= (3 × (100 × 80)) + (2 × 80²)
= 24.000 + 12.800
= 36.800 cm²
= 3,68 m²
Harga kaca untuk membuat akuarium
= 3,68 × 90.000
= Rp 331.200,00 (D)
Semoga membantu :)