Pi is the ratio of a circle's circumference to its diameter, about 3.14159.
Pi radians is equal to 180 degrees.
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1 degree = pi*radian/180 So therefore 15 times pi*radian/180 = pi*radian/12
pi radian
A radian is 180/pi degrees, or about 57 degrees
A radian is an arc of the circumference of a circle and it is about 57.3 degrees.
pi