Surveying
In triangulation surveys

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

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Surveying
The length of a chain is measured from

centre of one handle to centre of other handle
outside of one handle to inside of other handle
inside of one handle to inside of other handle
outside of one handle to outside of other handle

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