Learning to find the reference angle in the third quadrant

The video tutorial explains how to determine the reference angle for an angle of 205 degrees. It begins by defining the reference angle as the acute angle between the terminal side of an angle and the x-axis. The tutorial then demonstrates how to sketch 205 degrees in standard position, noting that it lies in the third quadrant. Finally, it calculates the reference angle by subtracting 180 degrees from 205 degrees, resulting in a reference angle of 25 degrees.

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