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Q.

If the total surface area of a cube is 2646 cm2, then find the length of each side of the cube.

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a

14 cm

b

21 cm

c

28 cm

d

35 cm

answer is B.

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Detailed Solution

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It is known that the total surface area of a cube is given by 6 × (side)2.

It is given that the total surface area of the cube is 2646 cm2.

∴ 6 × (side)2 = 2646 cm2

⇒ (Side)226466 cm2

⇒ (Side)2 = 441 cm2

∴ Side = 441 cm = 21 cm

Thus, the length of each side of the cube is 21 cm.

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