Surveying
The necessary geometrical condition for triangulation adjustment is:

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

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Surveying
In triangulation surveys

The area is divided into triangular figures
All listed here
Sides are not measured excepting the base line
Control stations are located from which detailed surveys are carried out

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