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 Thread: Word Problem View Single Post
 06-17-2008 #5 Sillysidley   Join Date: Oct 2006 Posts: 822 Well, since we let the radius of the smaller circle be r so the bigger one is 2r-1, we can convert what it says to an equation: Since the difference of the areas is 33 pi, we have $(2r-1)^2\pi-r^2\pi=33\pi$, so we can divide out pi. __________________ .