6√3

it is 6 root 3

is it correct

it is not answer

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6√3

it is 6 root 3

is it correct

it is not answer

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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

=6×3√3

=18√3