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  • So you want the upper edge of each circle to be exactly on the hemisphere?

    Yes, ideally, although anything approximating that would be good

  • r will be constant; r = 20.

    h however will increase 1 x by each circle (n); hence h = 5*n

    I.e. The first d will be d1 = (20^2-(5x1)^2)^(1/2)

    Second one, d2 = (20^2-(5x2)^2)^(1/2)

    Solve that and you'll get your disc radius, d for n, n+1 ...

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