# As the radius increases, of the area enclosed in a circle. How much does the area of the circle increase between....?

The rate of increase, as the radius increases, of the area enclosed in a circle of radius 𝑥 cm is 2𝜋𝑥 𝑐𝑚^2. How much does the area of the circle increase between a radius of 3 cm and a radius of 8 cm?

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- rotchmLv 78 months agoFavourite answer
With a radius of 3 units, its area is π*3²

With a radius of 8 units, its area is π*8²

Thus the increase in area is the difference between these: π*8² - π*3² = left for you to numerically compute. This has nothing to do with rates & derivatives.

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