Surveying
Check lines (or proof lines) in Chain Surveying, are essentially required

To plot the offsets
To indicate the accuracy of the survey work
To increase the out-turn
To plot the chain lines

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Surveying
The necessary geometrical condition for triangulation adjustment is:

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

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