Posted by **Jessi** on Sunday, October 11, 2009 at 1:54pm.

How are the radii of 2 two concentric circles related to the distance between them?

I tried making an equation using their cirmcumferences but I was way off. All I did was subtract the inner circle's circumference from the outer circle's circumference and set it equal to the distance between them and I know that would never work

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