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= 6 × 144
= 864 cm²
Luas permukaan balok = ( 2 × ( 36 × 12 )) + ( 2 × ( 12 × 12 )) + ( 2 × ( 36 × 12 ))
= ( 2 × 432 ) + ( 2 × 144 ) + ( 2 × 432 )
= 864 + 288 + 864
= 2.016 cm²
Luas permukaan = 864 cm² + 2.016 cm² = 2.880 cm² - 288 cm²
= 2.592 cm²
Jadi, luas permukaan bangun tersebut adalah 2.592 cm²