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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

  • geometry -

    Not too sure if I understand the question correctly"the distance between them" ?
    who is the "them", the circles ?

    e.g. radius of first circle = 8
    radius of second circle = 3
    difference between them is 5

    So the distance between them is the difference of the two radii.

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