Associated Topics || Dr. Math Home || Search Dr. Math

### Fitting a Circle to a Given Set of Points

```Date: 08/12/2005 at 12:03:21
From: Jessica
Subject: circular regression

Given a set of points how do you calculate the circle of best fit?  In
other words, if you were given a set of points how would you find the
center and radius, or the equation for the circle of best fit?  Is
there a way to do it on Excel or the graphing calculator?

I believe it has something to do with the least squares method and the
distance formula.  I have found some programs you can purchase to
calculate it, but I was curious on the method.

```

```
Date: 08/12/2005 at 13:56:09
From: Doctor George
Subject: Re: circular regression

Hi Jessica,

Thanks for writing to Doctor Math.  This link has an excellent paper
on fitting curves, including least squares circles:

http://nvl.nist.gov/pub/nistpubs/jres/103/6/j36sha.pdf

Write again if you need more help.

- Doctor George, The Math Forum
http://mathforum.org/dr.math/
```
Associated Topics:
College Conic Sections/Circles
High School Conic Sections/Circles

Search the Dr. Math Library:

 Find items containing (put spaces between keywords):   Click only once for faster results: [ Choose "whole words" when searching for a word like age.] all keywords, in any order at least one, that exact phrase parts of words whole words

Submit your own question to Dr. Math
Math Forum Home || Math Library || Quick Reference || Math Forum Search

Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.
http://mathforum.org/dr.math/