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= ( p x l x t) + ( p x l x t)
= ( 21 x 21 x 29 ) + ( 42 x 21 x 21 )
= 12789 + 18522
= 31.311
luas permukaan = luas permukaan keci + luas permukaan besar
luas permukaan kecil = ( 2 x 29 x 21 ) + ( 2 x 29 x 21 ) + ( 1 x 21 x 21 )
= 2877
luas permukaan besar = ( 3 x 42 x 21 ) + ( 2 x 21 x 21 ) + ( 21 x 21 )\
= 3969
jadi lluas permukaan = 2877 + 3969 = 6846