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For an edge length l the diagonal is l√3. Here diagonal length is 6√3, then its edge length is 6. Surface area of cube is 6l^2 i.e. 6(6^2)=216 Answer: 216 cubic centimetres
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length of diagonal of cube =6√3
then the length of side =√(3√3)
total surface are of cube = 6a²
                                    = 6[√(3√3)]²
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