You can have 0.5 radians, no problem!
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arctan(0.5) = 0.4636 + k*pi radian = 26.5651 + k*180 degrees where k is an integer.
You cannot. A foot is a linear measure of displacement whereas a radian measures angular displacement. The two measure different characteristics and conversion between the two is not valid.
The radian is 0.523598776
1 degree = pi*radian/180 So therefore 15 times pi*radian/180 = pi*radian/12
A radian is an arc of the circumference of a circle and it is about 57.3 degrees.