pi/12 = (pi/12)/(2pi) = 1/24 of a circle ( = 15 degrees).
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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.
Radian = (180/pi)o
Pi is the ratio of a circle's circumference to its diameter, about 3.14159. Pi radians is equal to 180 degrees.
180 degrees = 1 pi radian. That means that there are 2 pi radians in a circle. Divide the number of degrees by 180 and you get the pi radians. You can also multiply the pi radians by 180 and get the number of degrees.