Because a radian is a far more versatile unit of measurement, especially in advanced mathematics.
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-1.257 radian
Degrees = (180/pi)*Radians
A radian is 180/pi degrees, or about 57 degrees
The radian is 0.523598776
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.