If R is the radius of the curve in metres and C is the chord length in metres what should be the expression to denote versine 'V' in millimetres?

- 1
  
  $V = 127 C^{2} / R$
- 2
  
  $V = 127 R^{2} / C$
- 3
  
  $V = 125 C^{2} / R$
- 4
  
  $V = 125 R^{2} / C$

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