See the instructions and you will have a pixelisated circle (-:
Thanks mathematics lessons xD. *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* This idea was in my head when I was a kid, my father learn to me trigonometry and then, I tried to think for a solution: and there it is ! *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Thanfs for @griffpatch too for the size of the square...
