Degrees = (180/pi)*Radians
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You must multiply that by pi/180, to convert to radians.
-1.257 radian
1.3089969
1 rad = 180°/pi Example: 1.6 rad = 1.6(180°/pi) 1.6 rad = 2880°/pi
1 revolution = 2pi radians therefore; 1 radian = 1revolution/2 pi radians = 0.159154943 revolution