### Home > INT3 > Chapter 11 > Lesson 11.1.1 > Problem11-12

11-12.

A plane is currently $250$ miles from its destination. If it continues on its current course, it will travel another $300$ miles and end up $75$ miles away from its destination. What adjustment does the plane need to make in its course direction to arrive at its destination?

Draw a triangle.

Use the Law of Cosines.

The plane needs to change its course $11.72^\circ$.