An airplane flies on a course of 110° at a speed of 1200 km/h. How far east of its starting point is it after 2 h?
From the diagram.
If the plane starts a point S on a bearing of
Distance from S to P:
If we are looking for the distance due east the plane is after 2 hrs, this is marked as X on the diagram.
We can find this distance using the cosine ratio. We first need to find angle a.