Triangle - Law of Cosine (Length, Area And Angle).
Note: At 1:38:00 , Example On Law Of Cosine Application (|RF|² = 810° + 648° - (2 x 810 x 648 x cos(137°) = 1843749.8618)
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Triangles (Law Of Sines).
Elevation And Depression.
Bearings Ans Distances.
