Please Help!! Math

Solve for following applying spherical trigonometry...
1.Papua New Guinea (37° 45'N, 122°27'W)(since course was 260°) distance travelled =2250nm.
A) use law of cosine to calculate a and thus altitude:or
B) use law of sine to calculate N and thus longitude: or
C) use law of sine to calculate B and thus the course on arrival..

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