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

9√2 cm
9√3 cm
18 cm
18√3

Correct Answer: 9√3 cm

Explanation:

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

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