# 3 point radius of curvature of a circle

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SANA il 19 Dic 2022
Commentato: cr il 19 Dic 2022
Hi if i have a single pore, and i have calculated pore boundries already, and i have matrix of x and y cordinates of the pore.
How can i calcualte radius of curvature of 3 points of that pore. Thank you
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### Risposte (1)

cr il 19 Dic 2022
Just fit a circle through the xy coordinate data and you would get centre and radius. See
https://lucidar.me/en/mathematics/least-squares-fitting-of-circle/
https://in.mathworks.com/matlabcentral/fileexchange/57668-fit-circle-through-3-points
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Matt J il 19 Dic 2022
Why does that matter? Obviously you can repeat the process for every set of 3 points that are of interest.
cr il 19 Dic 2022
I agree with Matt. You can do permute and repeat the circle fitting process for all combinations.

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