Surveying
The resection by two point problem as compared to three point problem

None of these
gives more accurate problem
takes less time
requires more labour

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Surveying
For mapping any country

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

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