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The diagonal of a cube is 9√3 cm long. Its total surface area isA. 243 cm2 B. 486 cm2 C. 324 cm2 D. 648 cm2 |
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Answer» We know that, Diagonal of the cube = \(a\sqrt{3}\) = \(a\sqrt{3}\) = \(\sqrt[9]{3}\) i.e. a = 9 Therefore, Total surface area of the cube = 6a2 = 6 × 9 × 9 = 486 cm2 Hence, option B is correct |
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