Surveying
In triangulation surveys

All listed here
The area is divided into triangular figures
Control stations are located from which detailed surveys are carried out
Sides are not measured excepting the base line

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Surveying
The meridian of a place is

A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
A great circle passing through the place and the poles
An arc of the great circle which passes through the place and is perpendicular to the equator
A semi-circle which passes through the place and is terminated at the poles

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