At what rate is the area of the circle changing

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Reference no: EM131175579

The radius of a circle is increasing at the rate of 1 inch per hour.

(a) At what rate is the area of the circle changing when the radius is 4 inches?

(b) At what rate is the circumference changing when the radius is:

(i) 4 inches;

(ii) 5 inches?

Reference no: EM131175579

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