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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 = 4 cm`

A

`6picm^2//s`

B

`4picm^2//s`

C

`8picm^2//s`

D

None of these

Text Solution

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The correct Answer is:
D
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Knowledge Check

  • Find the rate of change of the area of a circle with respect to its radius r when r= 5 cm, is

    A
    `8picm^2//cm`
    B
    `10picm^2//cm`
    C
    `11picm^2//cm`
    D
    None of these

  • Find the rate of change of the area of a circle with respect to its radius r when r= 5 cm, is

    A
    `8picm^2//cm`
    B
    `10picm^2//cm`
    C
    `11picm^2//cm`
    D
    None of these

  • Find the rate of change of the area of the circle with respect to its radius r when r = 6 cm is

    A
    `10pi`
    B
    `12pi`
    C
    `8pi`
    D
    None of these

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