The angle of internal friction of soil mass is the angle whose

- 1
  
  tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
- 2
  
  since is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
- 3
  
  cosine isequal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane
- 4
  
  none of these

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