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24000 = 40 x 20 x T
24000 = 8000 x T
T = 24000 : 8000
T = 3 cm
Luas Permukaan
( 2 x p x t ) + ( 2 x p x l ) + ( 2 x l x t )
( 2 x 40 x 3 ) + ( 2 x 40 x 20 ) + ( 2 x 20 x 3 )
240 + 1600 + 120
1960 cm²