Surveying
Height of instrument method of levelling is

None of these
less accurate than rise and fall method
more accurate than rise and fall method
quicker and less tedious for large number of intermediate sights

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Surveying
The necessary geometrical condition for triangulation adjustment is:

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

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