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

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

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Surveying
Contour interval is

Larger for accurate works
Larger if the time available is more
Inversely proportional to the scale of the map
Directly proportional to the flatness of ground

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