one radian is the angle whose arc length is equal to the radius
special case
for a complete circle, θ= 2πr /r
= 2Ï€ rad
generely for an circle we have θ= 360 degree
so 360 degree = 2Ï€ rad
1 degree = π/180 rad
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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.
1 degree = pi*radian/180 So therefore 15 times pi*radian/180 = pi*radian/12