nine-point circle
English
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Acute triangle ABC, with its nine-point circle
Alternative forms
Etymology
So called because the circle passes through nine points of interest: the feet of the three altitudes, the centers of the three sides, and the midpoints of the segments which join the triangle's vertices with its orthocenter.
Noun
nine-point circle (plural nine-point circles)
Further reading
nine-point circle on Wikipedia.Wikipedia
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