Long description
Each angle is counterclockwise to the terminal side. The first angle is 150 degrees, and the reference is 30 degrees between the terminal side in quadrant 2 and the negative x-axis: theta sub reference = 180 degrees minus 150 degrees = 30 degrees.
The second angle is 230 degrees with a reference of 50 degrees between the terminal side in quadrant 3 and the negative x-axis: theta sub reference = 230 degrees minus 180 degrees = 50 degrees.
The third angle is 285 degrees with a reference of 75 degrees between the terminal side in quadrant 4 and the positive x-axis: theta sub reference = 360 degrees minus 285 degrees = 75 degrees.
The fourth angle is 420 degrees with a full rotation and a reference of 60 degrees between the terminal ...
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