Nine-point circle: Difference between revisions

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==References==
==References==
* {{cite book | author=H.S.M. Coxeter | coauthors=S.L. Greitzer | title=Geometry revisited | series=New Mathematical Library | volume=19 | publisher=[[MAA]] | year=1967 | isbn=0-88385-619-0 }}
* {{cite book | author=H.S.M. Coxeter | coauthors=S.L. Greitzer | title=Geometry revisited | series=New Mathematical Library | volume=19 | publisher=[[MAA]] | year=1967 | isbn=0-88385-619-0 }}[[Category:Suggestion Bot Tag]]

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In triangle geometry, the nine-point circle is a circle containing nine points of significance to the triangle: the mid-points of the sides; the feet of the altitudes; the mid-points of the segments from the vertices to the orthocentre. The centre of the nine-point circle lies on the Euler line; the radius is half that of the circumcircle.

References