# 9-point Circle as a Locus of Concurrency:

What Is This About?

A Mathematical Droodle

The applet illustrates a theorem published in 1857 by Griffiths:

If a point moves on a fixed line through the circumcenter, its pedal circle passes through a fixed point on the nine point circle.

|Activities| |Contact| |Front page| |Contents| |Geometry|

Copyright © 1996-2018 Alexander Bogomolny

67087066