By using sieve analysis, the particle size distribution curve has been plotted for a particular soil. The coefficient of curvature $C_{e}$ is given by

- 1
  
  $\frac{D_{30}}{D_{30} x D_{10}}$
- 2
  
  $\frac{\sqrt{D_{30}}}{D_{60} x D_{10}}$
- 3
  
  $\frac{D_{30}}{\sqrt{D_{60} x D_{10}}}$
- 4
  
  $\frac{D_{30}^{2}}{D_{60} x D_{10}}$

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