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.

Explanation

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Copyright © 1996-2018 Alexander Bogomolny

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