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prbandingan rusuk kubus =3 == 4
panjang balok = 4 x 4 = 16
perbandingan sisi balok p:l:t= 4 3 : 2
p= 16
l= 4x 3 =12
t = 4x 2 =8
luas permukaan =2[(16.12)+(12.8)+(16.8) = 832