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What is the total surface area of a cube whose side is 3a units?

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27a² square units.

36a² square units.

54a² square units.

64a² square units.

answer is C.

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Detailed Solution

It is known that the total surface area of a cube whose side is l is given by 6l² .

Now, the side of the given cube is 3a units.

∴ Total surface area of the given cube = 6(3a)² square units

= 6 × 9a² square units

= 54a² square units

Thus,the total surface area of the given cube is 54a² square units.

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