9-point Circle as a Locus of Concurrency:
What Is This About?
A Mathematical Droodle

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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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9-point Circle as a Locus of Concurrency:What Is This About? A Mathematical Droodle

This applet requires Sun's Java VM 2 which your browser may perceive as a popup. Which it is not. If you want to see the applet work, visit Sun's website at http://www.java.com/en/download/index.jsp, download and install Java VM and enjoy the applet.

9-point Circle as a Locus of Concurrency:
What Is This About?
A Mathematical Droodle