A swimmer wants to cross a river, swimming directly from point A to point B, as shown in the figure. The distance d_1 (from A to C) is 179 m, the distance d_2 (from C to B) is 137 m, and the speed v_r of the current in the river is 5.00 km/h. Suppose that the swimmer's velocity relative to the water makes an angle of 34.0 degrees with the line from A to C, as indicated in the figure.
What is the angle between the velocity vector for the swimmer with respect to a stationary observer (i.e. an observer standing at rest on the shore) and the riverbank? Hint: you should draw a triangle expressing the necessary addition of velocities for this problem.
The Attempt at a Solution
I thought it was 56 degrees because 90-34=56 but this is wrong.
i dont even understand the question i guess. Can anyone better explain this to me? i dont get what angle i am looking for.