Re: [math-fun] Curve-fitting methods ?

Brent Meeker <meekerdb@verizon.net> wrote:

What you do is iterate. You can take three points and using spherical geometry determine a radius and a center.

But any three points that obey the triangle inequality are compatible with any radius of curvature whatsoever. (Except for a radius less than that which makes them coplanar with the center of the circle they're on.)