360degrees is 2pi radians, then 180degrees is pi radians, then 90degrees is pi/2 radians.
90 degrees is pi/2 radians... then 45degrees is pi/4 radians. OK!
Pi / 4 = 0.78539816339744830961566084581988 radians
There are 2 x Pi radians to a circle, so 45 degrees is a quarter of 1 Pi radian because it's an eighth of a circle.
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360degrees is 2pi radians, then 180degrees is pi radians, then 90degrees is pi/2 radians.
90 degrees is pi/2 radians... then 45degrees is pi/4 radians. OK!
Pi / 4 = 0.78539816339744830961566084581988 radians
There are 2 x Pi radians to a circle, so 45 degrees is a quarter of 1 Pi radian because it's an eighth of a circle.