Surveying
For mapping any country

Geodetic triangulation of greatest possible sides and accuracy is carried out
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

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

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Sum of any two sides is greater than the third
Sum of the three angles is equal to two right angles
Every angle is less than two right angles
Sum of the three angles less than six right angles and greater than two right angles

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