## Precalculus (6th Edition) Blitzer

The best sailing angle is $105{}^\circ$ and the speed at that angle is 7.5 knots.
The speed is represented by the first component of the point and the sailing direction is represented by the second component . A sailboat racer would like to choose a direction angle that gives him the maximum speed. Of the four points, 7.5 is the highest speed component and the corresponding direction angle is $105{}^\circ$.