There are no degrees in pi, it is a ratio.
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360
if 360 degrees is equal to 2 Pi (3.14...) so 180 degrees is equal to 1 PI or just Pi
45 degrees are pi/4 radians. You can verify this with a unit circle.
A radian is an arc of a circle whose size is the same as its radius and in degrees it is about 57.3 degrees because there are 360 degrees around a circle and so 2*pi radians = 360 degrees. 2 pi = 360 degrees therefore 18 degrees = 2 pi x 18/360 radians = 0.1 pi radians
540 degrees, or 3*pi radians.