1 radian = 360/tau (or 180/pi) of a whole turn.
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The radian measure IS the arc length of the unit circle, by definition - that is how the radian is defined in the first place.
1 radian = 1/tau or 1/(2*pi) of a whole turn.
A radian is an arc of the circumference of a circle and it is about 57.3 degrees.
1 degree = pi*radian/180 So therefore 15 times pi*radian/180 = pi*radian/12
1 rotation/1 min * 1 min/60s * (2*Pi radian/1 rotation)