The difference between a level line and a horizontal line is that

- 1
  
  A level line is a curved line while a horizontal line is a straight line
- 2
  
  Level line is normal to plumb line whereas horizontal line may not be normal to plumb line at the tangent point to level line
- 3
  
  Horizontal line is normal to plumb line while level line may nit be normal to the plumb line
- 4
  
  both are same

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