[bonzini]

Angles in the SI are a ratio of two lengths (and solid angles are a ratio of two surfaces), so degrees are also a ratio of two lengths. 1 degree is a ratio of pi/180=0.01745, which happens to be 1/360th of a revolution; and you have to write down the unit to indicate the multiplicative factor. But writing down radians is just for clarity.

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I don't understand the debate, radians & degrees are just 2 proportional units, just like meter & kilometer