A sailor in a small sailboat encounters shifting winds. She sails 2.00 Ian east, then 3.50 Ian

Question:

A sailor in a small sailboat encounters shifting winds. She sails 2.00 Ian east, then 3.50 Ian southeast, and then an additional distance in an unknown direction. Her final position is 5.80 km directly east of the starting point (Fig. 1.39). Find the magnitude and direction of the third leg of the journey. Draw the vector addition diagram and show that it is in qualitative agreement with your numerical solution.

A sailor in a small sailboat encounters