Surveying
The longitudes of two places at latitude 60° N are 93° E and 97° W. Their departure is

500 nautical miles
120 nautical miles
5100 nautical miles
5700 nautical miles

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Surveying
In triangulation surveys

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

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