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Verified answer
Jawabannya :Luas permukaan balok
= 2 × ( p × l ) + ( p × t ) + ( l × t )
= 2 × ( 8 × 20 ) + ( 8 × 6 ) + ( 20 × 6 )
= 2 × ( 160 + 48 + 120 )
= 2 × 328
= 656 dm²
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Verified answer
Rumus mencari luas permukaan2×(p×l+p×t+l×t)
2×(8 dm × 20 dm +8 dm × 6 dm + 20 dm × 6 dm)
2×(160 dm+48 dm + 120 dm)
2×328 dm=656 dm ²