Surveying
In triangulation surveys

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

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Surveying
For a line AB

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

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