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.

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