The necessary geometrical condition for traingulation adjustment, is

- 1
  
  The sum of the angles around a station should be 360 $°$
- 2
  
  The sum the three angles of a plane traingle should be $180 °$
- 3
  
  The sum of the eight angles of a braced quadrilateral should be $360 °$
- 4
  
  All the above

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