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  1. If the length of the diagonal of a cube is 8√3cm, then its surface area is
    1. 192 cm²
    2. 512 cm²
    3. 768 cm²
    4. 384 cm²
Correct Option: D

If the length of the edge of cube be x cm, then
diagonal = √3x cm
∴ √3x = 8√3 ⇒ x = 8cm
∴ Surface area of the cube = 6x² = 6 × 8 × 8 = 384 sq. cm


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