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A Surveying Problem which asks: Determine the position of an unknown accessible point 
by its bearings from
three inaccessible known points 
, 
, and 
.
See also Surveying Problems
References
Dörrie, H. ``Annex to a Survey.'' §40 in 100 Great Problems of Elementary Mathematics: Their History and Solutions.
New York: Dover, pp. 193-197, 1965.