Factors From Finite Areas to Finite Areas
C-53: Annulus to coaxial annulus of different outer radius; both annuli have inner radius of blocking coaxial cylinder.
R1 = r1/h; R2 = r2/h; Rc = rc/h; A = R12-Rc2;
B = R22-Rc2; C=R2+R1; D=R2-R1; Y=A1/2+B1/2
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