Let P be a point on a curve. Let C be the center of osculating circle at P. Now, the locus of the vector C-P is the radial of the curve C.
The radial curve is very much related to curvature of a curve, in that it gives a visual map of a curve's curvature change.
See also: evolute, Curvature.
Curve relations by radial
|Kampyle of Eudoxus
Related Web Sites
See: Websites on Plane Curves, Plane Curves Books .
Robert Yates: Curves and Their Properties .