tri·an·gu·la·tion 
/traɪˌæŋgjəˈleɪʃən/ noun
/traɪˌæŋgjəˈleɪʃən/ noun [noncount] technical : a method of finding a distance or location by measuring the distance between two points whose exact location is known and then measuring the angles between each point and a third unknown point
— tri·an·gu·late /traɪˈæŋgjəˌleɪt/ verb, tri·an·gu·lates; tri·an·gu·lat·ed; tri·an·gu·lat·ing [+ obj]
▪ Using the device we were able to triangulate the building's precise location.
▪ Using the device we were able to triangulate the building's precise location.
