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If the circumference of a circle changes...

If the circumference of a circle changes at the rate of `0.7 pi cm //sec`, then, when the radius is 5 cm, the radius is changing at the of

A

`0.7cm //sec`.

B

`7 cm//sec`

C

`3.5 cm //sec`

D

`0.35 cm //sec`

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The correct Answer is:
D
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