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The rate of change of the area of a circ...

The rate of change of the area of a circle with respect to its radius r at r = 6 cm is:

A

`10pi`

B

`12pi`

C

`8pi`

D

`11pi.`

Text Solution

Verified by Experts

The correct Answer is:
b
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Knowledge Check

  • The rate of change of the area of a circle with respect to its radius at r = 2 cm is :

    A
    `8pi`
    B
    `2pi`
    C
    `4pi`
    D
    `11pi`

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

    A
    `6picm^(2)//cm`
    B
    `4picm^(2)//cm`
    C
    `5picm^(2)//cm`
    D
    None of these.

  • The rate of change of the area of a circle with respect to its radius at r = 5, is :

    A
    `10pi`
    B
    `8pi`
    C
    `12pi`
    D
    `13pi.`

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