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Find the rate of change of the area of a...

Find the rate of change of the area of a circle with respect to its radius `r` when `r=5c mdot`

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Knowledge Check

  • The rate of change of area of circle with respect to its radius r at r =3 cm is :

    A
    `6pi`
    B
    `8pi`
    C
    `12pi`
    D
    `3pi`
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