How many degrees does a plane turn when changing course from 045° to 135°?

• A. 45°
• B. 60°
• C. 90°
• D. 120°

Answer: (C)

To determine how many degrees a plane turns when changing course from 045° to 135°, you simply need to find the difference between the two angles.

Start by subtracting the initial course (045°) from the new course (135°):

135° - 045° = 90°.

This calculation shows that the plane has turned 90 degrees clockwise. In navigation and other applications, this is a straightforward way to measure turns since they are often indicated in degrees from a reference point, typically North being 0°.

In this case, the turn from 045° (which represents northeast) to 135° (southeast) is indeed a shift of 90 degrees in the direction of the turn, confirming that the correct answer is 90°.