* values like 3, 1/2, 3-3/4, 4 1/2, 7.5cm, etc. Add mm or cm for metric.
C is half the distance from end to end. D is the offset amount of the curve.
RC+D = R RC = R-D RC^2 + C^2 = R^2 (R-D)^2 + C^2 = R^2 R^2 - 2*R*D + D^2 + C^2 = R^2 D^2 + C^2 = 2*R*D R = (D^2 + C^2) / (2*D)See the CGI source
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