panjang balok 8 cm,lebar 7 cm,tinggi 3 cm.Berapa luas permukaan tersebut?

Luas permukaan =
- 8 cm x 7 cm = 56 cm²
- 8 cm x 3 cm = 24 cm²
- 3 cm x 7 cm = 21 cm²
→ 56 cm² + 24 cm² + 21 cm² = 101 cm² x 2 = 202 cm²
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L = 2 X [( p X l ) + ( p X t ) + ( l X t )]
L = 2 X [( 8 X 7 ) + ( 8 X 3 ) + ( 7 X 3 )]
L = 2 X ( 56 + 24 + 21 )
L = 2 X 101
L = 202 cm

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