A Surveying Problem: from the position of two known but inaccessible points and , determine the position of two unknown accessible points and by bearings from , , to and , , to .
See also Surveying Problems
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.