Oh, I think writing it out may have got me thinking about it enough to figure it out, but I'm not sure how I test it mathematically.
I'm thinking that (x/diameter)circumference=y
edit: nope, doesn't work, because if we draw the diameter then draw a radius at a right angle from the center of the circle, we know that a^2+b^2=c^2, and with a right angle c!=a yet that's what would be necessary for my equation above to work. =-\
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