If the volume of a cube is 729 cu cm, what is the length

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If the volume of a cube is 729 cu cm, what is the length of its diagonal ?

1. 9√2 cm
2. 9√3 cm
3. 18 cm
4. 18√3

Correct Option: B

Volume of cube = (Side)³
∴ 729 = a³
⇒ a = 9 cm
Diagonal of cube = side x √3 = 9 x √3
= 9√3 cm