Surveying
For adjusting a quadrilateral whose both the diagonals are observed, the equations of conditions involved, are

Two angle equations and two side equations
Three angle equations and one side equation
One angle equation and three side equations
None of these

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Surveying
The necessary geometrical condition for triangulation adjustment is:

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°
All listed here

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