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The angle and the radian are two different units that describe the same thing. You can find out how the angle and the radian are defined and calculated in more detail in this video. Any questions? Then ask them in the comments! Need to know more? Then feel free to subscribe: http://bit.ly/Mathe_Abo Any questions? Then ask them in the comments! Check out the other must-know channels: German: http://bit.ly/Deutsch_Abo Chemistry: http://bit.ly/Chemie_Abo History: http://bit.ly/Geschichte_Abo Physics: http://bit.ly/Physik_Abo