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Find the rate of change of the area of c...

Find the rate of change of the area of circle with respect to its radius r when :
(a) r = 3 cm (b) r = 4 cm.

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Find the rate of change of the area of a circle with respect to its radius r when (a) r=3cm (b) r=4cm

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Knowledge Check

  • 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.

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