I don't know how to approach this question (help would be greatly appreciated!)
Find the average rate of change of the area of the circle with respect to its radius r as r changes from:
(i) 2 to 3, (ii) 2 to 2.5, (iii) 2 to 2.1

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2pi(2) + 2pi(3)
------------- is this right?
2

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