The radial offset at a distance X from the point of commencement of curve of radius R is given by

- 1
  
  √R^2 - X^2 - R
- 2
  
  R - √ R^2 - X^2
- 3
  
  R - √R^2 + X^2
- 4
  
  √R^2 + X^2 - R

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