Surveying
Triangulation surveys are carried out for locating

All of these
Control points for photogrammetric surveys
Engineering works, i.e. terminal points of long tunnels, bridge abutments, etc.
Control points for surveys of large areas

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Surveying
The length of a chain is measured from

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

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