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Mathematics 9 Online
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

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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