If R is the radius of circular curve, then the versine on a chord of length C is given by

- 1
  
  $\frac{C^{2}}{4 R}$
- 2
  
  $\frac{C}{8 R}$
- 3
  
  $\frac{C^{2}}{8 R}$
- 4
  
  $\frac{C}{4 R}$

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