# Talk:Equation of Circle

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Worth expanding the page to cover non-origin-centered circles? I can't get onto this today myself, have a family reunion to attend ... --Prime.mover 08:46, 2 May 2009 (UTC)

Yeah, I just have to look up the polar and parametric equations for a non-origin-centered circle. --Cynic (talk) 17:12, 2 May 2009 (UTC)

I think it's as simple as multiplying out $\left({x-a}\right)^2 + \left({y-b}\right)^2 = R^2$. The general ellipse is more fiddly and in order to do it justice we need to bring on board linear transformations (specifically rotations) and it gets messy. I'll go there once I've done the fiendishly technical Mathematical Logic in which I'm building up to Godel. --Prime.mover 21:54, 2 May 2009 (UTC)