Just as you can measure a distance in metres and centimetres or in feet and inches, you can measure angles in degrees or radians.
You can either set your calculator to radians, or convert from radians to degrees using
1 radian = 180/pi degrees = 57.3 degrees approx
or
1 degree = pi/180 radians.
The radian is 0.523598776
1 degree = pi*radian/180 So therefore 15 times pi*radian/180 = pi*radian/12
Radian - Morituri - was created in 1986.
A radian is an arc of the circumference of a circle and it is about 57.3 degrees.
One radian is about 57.3 degrees
A radian is 180/pi degrees, or about 57 degrees
-1.257 radian
radian = 180/2pi 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.
The radian measure IS the arc length of the unit circle, by definition - that is how the radian is defined in the first place.
There is no relationship between electric charge and a radian which is an angular measurement.