The extremities of parallel radii of two circles are called homologous with respect to the similitude center collinear with them.
Homologous Points
See also
Antihomologous Points, Invariable Point, Similitude CenterExplore with Wolfram|Alpha
References
Johnson, R. A. Modern Geometry: An Elementary Treatise on the Geometry of the Triangle and the Circle. Boston, MA: Houghton Mifflin, p. 19, 1929.Referenced on Wolfram|Alpha
Homologous PointsCite this as:
Weisstein, Eric W. "Homologous Points." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/HomologousPoints.html