Nine-Point Circle
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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.
Contributed by: Chris Boucher (June 2007)
Open content licensed under CC BY-NC-SA
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"Nine-Point Circle"
http://demonstrations.wolfram.com/NinePointCircle/
Wolfram Demonstrations Project
Published: June 5 2007