1 radian = 1/tau or 1/(2*pi) of a whole turn.
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No. Centimetres are a measure of linear displacement whereas radians measure angular displacement. Because they measure different things, it is not possible to convert from one to the other.
There can be no equivalence. A kilometre is a measure of linear displacement while a degree [rotation] is a measure of angular displacement. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed. For any angular rotation, the linear displacement is directly proportional to the distance from the centre of rotation.
2pi/60 or pi/30 radians per second
It is the derived unit of plane angle and 1 radian = one full rotation/2π. Also, it is equal to 57.296°.
There can be no equivalence. A mil is a measure of length or linear displacement while a revolution is a measure of angular displacement. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.