"نو نقاطی دائرہ" کے نسخوں کے درمیان فرق

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*[http://rykap.com/ninePointCircle "A Javascript demonstration of the nine point circle"]{{wayback|url=http://rykap.com/ninePointCircle |date=20120808032604 }} at rykap.com
*[http://faculty.evansville.edu/ck6/encyclopedia/ETC.html ''Encyclopedia of Triangles Centers''] by Clark Kimberling. The nine-point center is indexed as X(5), the Feuerbach point, as X(11), the center of the Kiepert hyperbola as X(115), and the center of the Jeřábek hyperbola as X(125).
* History about the nine-point circle based on J.S. MacKay's article from 1892: [http://jwilson.coe.uga.edu/EMT668/EMT668.Folders.F97/Anderson/geometry/geometry1project/historyofninepointcircle/history.html History of the Nine Point Circle] {{wayback|url=http://jwilson.coe.uga.edu/EMT668/EMT668.Folders.F97/Anderson/geometry/geometry1project/historyofninepointcircle/history.html |date=20130920090850 }}
* {{mathworld|urlname=Nine-PointCircle|title=Nine-Point Circle}}
* {{mathworld|urlname=Orthopole|title=Orthopole}}