Surveying
An imaginary line lying throughout the surface of ground and preserving a constant inclination to the horizontal is known as

contour gradient
contour line
horizontal equivalent
contour interval

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

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