Surveying
For mapping any country

Geodetic triangulation of greatest possible sides and accuracy is carried out
All listed here
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys

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Surveying
For a line AB

none is correct
the forebearing of AB and back bearing of BA differ by 180°
the forebearing of AB and back bearing of AB differ by 180°
both (A) and (B) are correct

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