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 360 degrees correspond to 2 * π  radians.
1 radian corresponds to  360 / 2π  degrees
If you have 0.5 as the number to convert to angle,  you will multiply by 360 and divide by 2π. you get your angle.

 Often, if an angle is more than 360 degrees, 360 degrees can be subtracted from the angle.
2 5 2