Surveying
The necessary geometrical condition for triangulation adjustment is:

All listed here
The sum of the three angles of a plane triangle should be 180°
The sum of the angles around a station should be 360°
The sum of the eight angles of a braced quadrilateral should be 360°

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

linear measurements are more accurate than angular measurements
linear and angular measurements of the traverse are of equal accuracy
All of these
angular measurements are more accurate than linear measurements

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