-1.257 radian
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Degrees = (180/pi)*Radians
You must multiply that by pi/180, to convert to radians.
radian = 180/2pi 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.
pi