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Question

If the length of a diagonal of a cube is 83 cm, then its surface area is

(a) 512 cm2

(b) 384 cm2

(c) 192 cm2

(d) 768 cm2

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Solution

Let,

Side of the cube

Length of the diagonal

We have to find the surface area of the cube

Surface area of the cube,

Thus, surface area of the cube is.

Hence, the correct choice is (b).


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