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= 2 (60 * 50 + 20 * 50) + 60 * 20
= 2 (3000 + 1000) + 1200
= 2 * 4000 + 1200
= 8000 + 1200
Lp. Balok = 9200 cm²
= 0,92 m²
Sisa kaca = 1 m² - 0,92 m²
= 0,08 m² atau 800 cm²