A Cute Property of the 9 Point Circle

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Drag the vertices A, B, and C to adjust the triangle.

In a scalene (that is, with all sides of different lengths), the feet of the altitudes separate the other 6 points on the 9 point circle into a group of three, a group of two, and one lone point.

Copyright © 2003 Joe Christy joe @ eshu.net.

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