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15x12x2=360
15x25x2=750
25x12x2=600
360+750+600=1710cm
dik : p = 15 , l = 12 , t = 8
jawab : luas balok : 2 [( p . l ) + ( p . t ) + ( l . t )]
2 [( 15 . 12 ) + ( 15 . 8 ) + ( 12. 8 )
2 ( 180 + 120 + 90 )
2 . 390 = 780