How to determine the reference angle of an angle in degrees

The video tutorial explains reference angles, which are acute positive angles between the X-axis and the terminal side. It emphasizes the importance of understanding reference angles without needing to sketch them. The tutorial uses a 125-degree angle as an example, showing how to calculate the reference angle by subtracting from 180 degrees, resulting in a 55-degree reference angle. The video also clarifies that reference angles are always positive, regardless of direction.

Describe the process of sketching an angle and finding its reference angle.

What is a reference angle and how is it determined?

Explain why reference angles are always positive.

How do you calculate the reference angle for an angle of 125 degrees?

What is the relationship between the angle theta and its reference angle theta prime?