Hitunglah luas permukaannya
Lp kubus = 6 × S²
= 6 × 8²
= 6 × ( 8 × 8 )
= 6 × 64
= 384 cm²
Lp balok = 2 × { ( p × l ) + ( p × t ) + ( t × l ) }
= 2 × { ( 10 × 8 ) + ( 10 × 20 ) + ( 20 × 8 ) }
= 2 × { 80 + 200 + 160 }
= 2 × 440
= 880 cm²
Lp gabungan 384 + 880 = 1,264
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