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OpenStudy (anonymous):
PLEASE HELP!!! The rate of increase, as the radius increases, of the area enclosed in a circle of radius x cm is 2pi x cm^2. How much does the area of the circle increase between a radius of 3 cm and a radius of 9 cm
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OpenStudy (anonymous):
Area of radius 3: 9pi Area of radius 9: 81pi Increase of 81pi - 9pi = 72pi Keep in mind that the area of a circle, A = pi(radius)^2.
OpenStudy (anonymous):
ok nice thanks
OpenStudy (anonymous):
welcome.
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