You do not. A metre is a measure of linear displacement whereas a radian is a measure of angular displacement. The two measure different things and, according to the basic principles of dimensional analysis, conversion from one to the other is fundamentally invalid.
The radian is 0.523598776
Radian - Morituri - was created in 1986.
1 degree = pi*radian/180 So therefore 15 times pi*radian/180 = pi*radian/12
1 radian=1.33 steradian
A radian is 180/pi degrees, or about 57 degrees
radian = 180/2pi degrees
One radian is about 57.3 degrees
A radian is an arc of the circumference of a circle and it is about 57.3 degrees.
A mile is an obsolete unit of distance and the radian is a unit for angles !
1 radian = 360/tau (or 180/pi) degrees.