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

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

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Surveying
For mapping any country

Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
All listed here
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
Geodetic triangulation of greatest possible sides and accuracy is carried out

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