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The radius of a circle is increasing at ...

The radius of a circle is increasing at the rate of 0.14 cm/sec. The rate of change of its area at r = 7 cm is

A

`1.96pi`

B

0.98 cm

C

`14pi`

D

None of these

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • If the side of a square is increasing at the rate of 3cm/sec, then rate of change of its perimeter is

    A
    3 cm/sec
    B
    6 cm/sec
    C
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    D
    12 cm/sec

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