an aircraft flies from airport A on a bearing of 235 to another airport B 120km from A. It then flies 70km due to south to another airport C and finally 20km due east to its destination D.
+130540 And I assume that you want the distance and bearing from A to D????....if so, look at the following pic :
Using trig, D is located at an angle =
tan-1 (-138.829 / -78.298) + 180° = about 240.577° from A
This is a bearing of 180 + (270- 240.577) = about 209. 423°
And the distance, as shown, is about 159.387 km from A
