The nine-point circle associated with a given triangle passes through the perpendicular feet (green), the midpoints of the sides (black), and the midpoints (red) of the segments connecting the vertices with the orthocenter H.
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Published: June 5, 2007
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Nine-Point Circle in the Complex Plane
The Center and Radius of the Nine-Point Circle
A Triangle Formed by the Centers of Three Nine-Point Circles
A Collinearity between the Nine-Point Center, the Foot of an Altitude, and a Midpoint
Adams' Circle and the Gergonne Point
The Conway Circle
The Second Lemoine Circle
The Fuhrmann Circle
High School Geometry
High School Mathematics
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