is there an easy way to remember this, because I can't. I don't really understand how it goes from 5 pie / 6 on the top left, and on the bottom left it's 7 pie / 6, etc... for all the numbers...
C=2*pi*r so the top (the +y axis) is (1/4)C or pi/2 radians. (1/2)C (to the -x axis) is pi radians. 3/4 (-y axis) is 3*pi/2. Back to the +x axis is 2*pi.
To change radians to degrees multiply by 180/pi so pi/2 = 90°
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