Surveying
The following sights are taken on a “turning point”

foresight only
foresight only
foresight and intermediate sight
foresight and backsight

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Surveying
The necessary geometrical condition for triangulation adjustment is:

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

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