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maka, Luas permukaannya adalah : 2 ( p x l ) + 2 ( p x t ) + 2 ( l x t )
=> 2 ( 5 x 4 ) + 2 ( 5 x 15 ) + 2 ( 4 x 15 )
= 2 (20) + 2 (75) + 2 (60)
= 40 + 150 + 120
= 310
= 2 [20 + 75 + 60] cm²
= 310 cm²