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If the area of a circle change at the ra...

If the area of a circle change at the rate of `0.8 cm^(2)//sec`, then, when the radius is 4 cm , it circumference changes at the rate of

A

`2 cm //sec`

B

`0.2 cm//sec`

C

`0.4 cm //sec`.

D

` 0.8cm //sec`

Text Solution

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The correct Answer is:
B
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