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    Differential calculus 2 Zozosmithy

    The area of a circle is increasing at a rate of 6cm squared s -1.

    i) Find in terms of r, dC

    . --------

    . dr, the rate of change of the area with respect to the radius.

    ii) Find, in terms of r, dA

    . -------

    . dr, the rate of change of the area with respect to the radius.

    iii) Hence, find dC

    . --------

    . dA in terms of r.

    iv) Find dC

    . -------

    . dt, the rate of increase of the circumference, when the radius is 3cm.

    If someone could tell me how to do this it would be greatly appreciated, thanks in advance :)

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      Zozosmithy

      dC is over dr. dA is over dr. dC is over dA. dC is over dt.

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      Brian-96

      it looks like part i) and ii) are the same . Da/DR makes sense but Dc/Dr doesnt make any sense.

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      Me

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