Homework Help: math

Posted by anonymous on Monday, May 21, 2007 at 10:04pm.

direct variation

the surface area of a sphere varies directly as the square of the radius. if the surface area of a sphere is 36 pi meters squared when the radius is 3 meters, what is the surface area of a sphere with a radius of 6 meters?

S=k*r^2

solve for k first.

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