The factor of Safety of an infinite slope in a sand deposit is found to be 1.732. The angle of shearing resistance of the sand is $30 °$ . The average slope of the sand deposit is given by

- 1
  
  $\sin^{- 1} (0.333)$
- 2
  
  $\cos^{- 1} (0.252)$
- 3
  
  $\tan^{- 1} (0.333)$
- 4
  
  $c o t^{- 1} (0.621)$

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