A cube has a side of length $2.342 m$ . The surface area and volume in correct significant figures are respectively:

32.90 m^{2}, 12.85 m^{3}

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5.49 m^{2}, 12.85 m^{3}

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5.485 m^{2}, 12.9 m^{3}

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5.49 m^{2}, 12.9 m^{3}

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Solution

The correct option is A $32.90 m^{2}, 12.85 m^{3}$
The side of the cube is expressed in $4$ significant figures.
So, area and volume also contains $4$ significant figures.
Hence, option (A) is correct.
Area $= 6 a^{2} = 32.90 m^{2}$
Volume $= a^{3} = 12.85 m^{3}$

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