Which method was introduced in this course to solve this que…

Which method was introduced in this course to solve this question: A pilot flies in a straight path for 1 hour 30 minutes. She then makes a course correction, heading 45 degrees to the right of her original course, and flies 2 hours 45 minutes in the new direction. If she maintains a constant speed of 205 mi/h, how far is she from her starting position? Give your answer to the nearest mile.