Monday, April 11, 2011

The Nine-Point Circle

Move the vertices of the triangle and observe what happens.

This is a Java Applet created using GeoGebra from - it looks like you don't have Java installed, please go to

The nine-point circle is the circle passing through the nine significant points defined from a triangle. It includes the midpoint of each side, the foot of each altitude, and the midpoints of the orthocenter and the three vertices.  

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