A superscript r.
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The radian is 0.523598776
Pi is the ratio of a circle's circumference to its diameter, about 3.14159. Pi radians is equal to 180 degrees.
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.
-1.257 radian