It is 1/tau or 1/(2*pi) of a whole turn.
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A radian is an arc of the circumference of a circle and it is about 57.3 degrees.
It is the derived unit of plane angle and 1 radian = one full rotation/2π. Also, it is equal to 57.296°.
1 radian = 1/tau or 1/(2*pi) of a whole turn.
The radian is 0.523598776
It is NOT a national unit but an international one.