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    Post Closed as "off topic" by Will Jagy, David Roberts, Andres Caicedo, algori, Dan Petersen

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Approximating (fitting) a circle given 3 points

I'm working on a computer vision program, and need advice on how to best fit a circle given 3 points from a possible one. The program randomly samples 3 vectors (2D points) from a model repeatedly until a good circle is found, using RANSAC.