Surveying
Triangulation surveys are carried out for providing

Height control
Planimetric control
None of these
Both planimetric and height control

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Surveying
The error due to eccentricity of inner and outer axes can be eliminated by

taking both face observations and taking the mean of the two
taking mean of several readings distributed over different portions of the graduated circle
double sighting
reading both verniers and taking the mean of the two

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