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What is the average rate of increase of the circle when the radius is from 1 cm to 3 cm?
Wiki User
∙ 14y ago
If you mean average rate of area increase, it is 4pi cm2/cm. Simply take the total change in area, 9pi-1pi=8pi, and divide it by the total expansion.
Wiki User
∙ 14y ago
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i dont know im only 5 A better answer: I assume you are taking differential calculus? A = (pi) R^2 dA/dt = 2 dR/dt cross multiply and find dA/dR = 2 dA/dR = 2 pi R = 2 R = 1/pi
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