The perpendicular offset from the tanget to the central point of the circular curve, is

- 1
  
  R sin $\frac{θ}{2}$
- 2
  
  R cos $\frac{θ}{2}$
- 3
  
  R(1 - cos $\frac{θ}{2}$ )
- 4
  
  R(1 - sin $\frac{θ}{2}$ )

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