If N is the algebraic differenc e of grades, S is the minimum sight distance in metres, the length(L) of a summit curve is

- 1
  
  $\frac{N S}{4}$
- 2
  
  $\frac{N S^{2}}{4}$
- 3
  
  $\frac{N^{2} S}{4}$
- 4
  
  $\frac{{(N S)}^{2}}{4}$

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