Surveying
The permissible error in chaining for measurement with chain on rough or hilly ground is

1 in 500
1 in 100
1 in 250
1 in 1000

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

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