Anna: An aero plane flies from airport A to B 90 km away on a bearing 070 degrees. From B to airport c, 100 km from B on a bearing 210 degrees . How far and on what course must the plane fly in order to return to A direct
Hi Anna,
This is what your vectors look like.
You can find the distance using the cosine rule
then
you can find the angle within the triangle using the sine or cosine rule followed by a little bit of deduction (to get the actual angle that you need)
Have fun.
140121 Vectors for Anna.jpg
+118654 
