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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.
Make it infinitesimally small.
Surface area of a cuboid with sides x, y and z is 2(xy+yz+zx) So surface = 2*(1.45*1.45 + 1.45*5 + 5*1.45) = 2*16.6025 = 33.205
Surface area of cuboid = 2*[L*B + B*H + H*L] where L = length, B = breadth, and H = height
The total surface area of a cuboid with edges of length a, b and c units is 2*(ab + bc + ca) square units.