In cross section. If each increment is equal in width, then the 20th increment (ring) is equal to that of the first 6.245 increments.
Mathematical Formula: M = [Square Root of 2N-1]
(N = the Nth Increment)
E.g., (2 X 20) - 1 = 39 ////// The square root of 39 is 6.245
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