Surveying
If ‘δ’ is the declination of the Polaris and ‘λ’ is the latitude of the place, the azimuth of the Polaris, is

cos δ/cos λ
cos (90° - δ)/cos (90° - λ)
sin (90° - δ)/sin (90° - λ)
tan (90° + δ)/tan (90° + λ)

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Sum of the three angles is equal to two right angles
Every angle is less than two right angles
Sum of any two sides is greater than the third
Sum of the three angles less than six right angles and greater than two right angles

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

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