Feuerbach 9 Point Circle

This Java applet demonstrates the properties of the Feuerbach 9 point circle. Click an drag the vertices to see the circle change and also see the relationship between the midpionts of the sides of the triangle, the foot points of the altitudes of the triangle and the midpoints of the line segments from the vertices to the orthocenter of the triangle.

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Jeff Morgan, Created with GeoGebra