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The edge of a cube is equal to the radiu...

The edge of a cube is equal to the radius of a sphere. If the edge and the radius increase at the same rate, then the ratio of the increases in surface areas of the cube and sphere is

A

`2pi : 3`

B

`3 : 2pi`

C

`6 : pi`

D

none of these

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The correct Answer is:
B
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OBJECTIVE RD SHARMA-DERIVATIVE AS A RATE MEASURER -Exercise
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  16. The diameter of a circle is increasing at the rate of 1 cm/sec. When i...

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