If the side of a cube is 9√3 cm, then its diagonal will be:

Correct option is B

Given:

Side length of the cube = $$9\sqrt{3} \, \text{cm}$$​ 

Formula used:

​$$\text{Diagonal} = \sqrt{3} \times \text{Side length}$$​​

Solution:

$$\text{Diagonal} = \sqrt{3} \times 9\sqrt{3}$$

Diagonal = 27 cm