Surveying
The necessary geometrical condition for triangulation adjustment is:

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

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Surveying
Spring tides are caused when

Sun and moon are in line with earth
Solar tidal force acts opposite to lunar tidal force
None of these
Solar tidal force and lunar tidal force both coincide

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