SOLUTION: If the radius of a circle is increased by 2 cm, the area will increase by 32πcm^2. what is the radius of the circle?

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Question 809596: If the radius of a circle is increased by 2 cm, the area will increase by 32πcm^2. what is the radius of the circle?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
pi*(r+2)^2-pi*r^2=32*pi
4 pi (r+1) = 32 pi
4 pi r-28 pi = 0
4 pi r=28pi
r=7