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A variant of Kosnita's theorem
(Wolfram Demonstration Project, 2016)
The Gergonne point
(Wolfram Demonstration Project, 2016)
The schiffler point
(Wolfram Demonstration Project, 2016)
Triangle altitudes and circumradius
(Wolfram Demonstration Project, 2016)
Triangle altitudes and inradius
(Wolfram Demonstration Project, 2016)
The sum of the reciprocals of the exradii
(Wolfram Demonstration Project, 2016)
A concurrency of lines joining orthocenters
(Wolfram Demonstration Project, 2011)
The product of the inradius and three exradii
(Wolfram Demonstration Project, 2011)
Triangle altitudes and circumradius
(Wolfram Demonstration Project, 2011)