Hyperbolas and orthologic triangles.
Čerin, Z. (1997)
Mathematica Pannonica
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Čerin, Z. (1997)
Mathematica Pannonica
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Bukor, József (2008)
Annales Mathematicae et Informaticae
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Čerin, Zvonko (2000)
Mathematica Pannonica
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Baica, Malvina (1988)
International Journal of Mathematics and Mathematical Sciences
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Čerin, Zvonko (2000)
Mathematica Pannonica
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Kynčl, Jan, Tancer, Martin (2008)
The Electronic Journal of Combinatorics [electronic only]
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Miguel de Guzmán (2001)
RACSAM
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A simple proof is presented of a famous, and difficult, theorem by Jakob Steiner. By means of a straightforward transformation of the triangle, the proof of the theorem is reduced to the case of the equilateral triangle. Several relations of the Steiner deltoid with the Feuerbach circle and the Morley triangle appear then as obvious.
Roland Coghetto (2016)
Formalized Mathematics
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We introduce, using the Mizar system [1], some basic concepts of Euclidean geometry: the half length and the midpoint of a segment, the perpendicular bisector of a segment, the medians (the cevians that join the vertices of a triangle to the midpoints of the opposite sides) of a triangle. We prove the existence and uniqueness of the circumcenter of a triangle (the intersection of the three perpendicular bisectors of the sides of the triangle). The extended law of sines and the formula...
Tian, Yongge, Liu, Yonghui (2007)
ELA. The Electronic Journal of Linear Algebra [electronic only]
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Paulus Gerdes (2003)
Visual Mathematics
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Stammler, Ludwig (1997)
Beiträge zur Algebra und Geometrie
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Liu, Jian (2008)
JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
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Mosić, Dijana, Djordjević, Dragan S. (2011)
ELA. The Electronic Journal of Linear Algebra [electronic only]
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