Surface area of cuboid = 2*[L*B + B*H + H*L]
where L = length,
B = breadth, and
H = height
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length *width*height=area of cuboid
It depends on whether they are stuck together so as to form a 1x1x6 cuboid or a 1x2x3 cuboid, or a 1x1x2 cuboid on top of a 1x2x2 cuboid. Each of these will give a different answer.
The total surface area of a cuboid with edges of length a, b and c units is 2*(ab + bc + ca) square units.
The total area of all the faces of the cuboid, because it is three dimensional it has six faces instead of just one like a normal rectangle has.
Make it infinitesimally small.