Enter the two bearings:
Distance=km, Bearning=°
\(c^2 = a^2 + b^2 - 2ac\cos{(180+b-d)}\)
\(c = (100.00)+(10000.00)-2.(10.00.100.00).cos(180+0.00-170.00)\)
\(c = 90.17 km\)
\(bearing = 168.90°\)