Altitude (triangle) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Altitude (triangle)" in English language version.

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4wolfram.com

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archive.org

Newton, Isaac (1971). "3.1 The 'Geometry of Curved Lines'". In Whiteside, Derek Thomas (ed.). The Mathematical Papers of Isaac Newton. Vol. 4. Cambridge University Press. pp. 454–455. Note Whiteside's footnotes 90–92, pp. 454–456.
Davies, Thomas Stephens (1850). "XXIV. Geometry and geometers" (PDF). Philosophical Magazine. 3. 37 (249): 198–212. doi:10.1080/14786445008646583. Footnote on pp. 207–208. Quoted by Bogomolny, Alexander (2010). "A Possibly First Proof of the Concurrence of Altitudes". Cut The Knot. Retrieved 2019-11-17.
Servois, Francois-Joseph (1804). Solutions peu connues de différens problèmes de Géométrie-pratique [Little-known solutions of various Geometry practice problems] (in French). Devilly, Metz et Courcier. p. 15.
Gauss, Carl Friedrich (1810). "Zusätze". Geometrie der Stellung. By Carnot, Lazare (in German). Translated by Schumacher. republished in Gauss, Carl Friedrich (1873). "Zusätze". Werke. Vol. 4. Göttingen Academy of Sciences. p. 396.
See Mackay, John Sturgeon (1883). "The Triangle and its Six Scribed Circles §5. Orthocentre". Proceedings of the Edinburgh Mathematical Society. 1: 60–96. doi:10.1017/S0013091500036762.

books.google.com

William H. Barker, Roger Howe (2007). "§ VI.2: The classical coincidences". Continuous symmetry: from Euclid to Klein. American Mathematical Society. p. 292. ISBN 978-0-8218-3900-3. See also: Corollary 5.5, p. 318.

cut-the-knot.org

Davies, Thomas Stephens (1850). "XXIV. Geometry and geometers" (PDF). Philosophical Magazine. 3. 37 (249): 198–212. doi:10.1080/14786445008646583. Footnote on pp. 207–208. Quoted by Bogomolny, Alexander (2010). "A Possibly First Proof of the Concurrence of Altitudes". Cut The Knot. Retrieved 2019-11-17.

doi.org

Hajja, Mowaffaq; Martini, Horst (2013). "Concurrency of the Altitudes of a Triangle" (PDF). Mathematische Semesterberichte. 60 (2): 249–260. doi:10.1007/s00591-013-0123-z.
Hogendijk, Jan P. (2008). "Two beautiful geometrical theorems by Abū Sahl Kūhī in a 17th century Dutch translation". Tārīk͟h-e ʾElm: Iranian Journal for the History of Science. 6: 1–36.
Davies, Thomas Stephens (1850). "XXIV. Geometry and geometers" (PDF). Philosophical Magazine. 3. 37 (249): 198–212. doi:10.1080/14786445008646583. Footnote on pp. 207–208. Quoted by Bogomolny, Alexander (2010). "A Possibly First Proof of the Concurrence of Altitudes". Cut The Knot. Retrieved 2019-11-17.
Servois, Francois-Joseph (1804). Solutions peu connues de différens problèmes de Géométrie-pratique [Little-known solutions of various Geometry practice problems] (in French). Devilly, Metz et Courcier. p. 15.
Gauss, Carl Friedrich (1810). "Zusätze". Geometrie der Stellung. By Carnot, Lazare (in German). Translated by Schumacher. republished in Gauss, Carl Friedrich (1873). "Zusätze". Werke. Vol. 4. Göttingen Academy of Sciences. p. 396.
See Mackay, John Sturgeon (1883). "The Triangle and its Six Scribed Circles §5. Orthocentre". Proceedings of the Edinburgh Mathematical Society. 1: 60–96. doi:10.1017/S0013091500036762.

evansville.edu

faculty.evansville.edu

Clark Kimberling's Encyclopedia of Triangle Centers "Encyclopedia of Triangle Centers". Archived from the original on 2012-04-19. Retrieved 2012-04-19.

fau.edu

forumgeom.fau.edu

Bell, Amy, "Hansen's right triangle theorem, its converse and a generalization", Forum Geometricorum 6, 2006, 335–342.
Marie-Nicole Gras, "Distances between the circumcenter of the extouch triangle and the classical centers", Forum Geometricorum 14 (2014), 51-61. http://forumgeom.fau.edu/FG2014volume14/FG201405index.html
Dorin Andrica and Dan S ̧tefan Marinescu. "New Interpolation Inequalities to Euler's R ≥ 2r". Forum Geometricorum, Volume 17 (2017), pp. 149–156. http://forumgeom.fau.edu/FG2017volume17/FG201719.pdf

pballew.net

""Orthocenter of a triangle"". Archived from the original on 2012-07-05. Retrieved 2012-05-04.

researchgate.net

Hajja, Mowaffaq; Martini, Horst (2013). "Concurrency of the Altitudes of a Triangle" (PDF). Mathematische Semesterberichte. 60 (2): 249–260. doi:10.1007/s00591-013-0123-z.
Hogendijk, Jan P. (2008). "Two beautiful geometrical theorems by Abū Sahl Kūhī in a 17th century Dutch translation". Tārīk͟h-e ʾElm: Iranian Journal for the History of Science. 6: 1–36.

sid.ir

Hajja, Mowaffaq; Martini, Horst (2013). "Concurrency of the Altitudes of a Triangle" (PDF). Mathematische Semesterberichte. 60 (2): 249–260. doi:10.1007/s00591-013-0123-z.
Hogendijk, Jan P. (2008). "Two beautiful geometrical theorems by Abū Sahl Kūhī in a 17th century Dutch translation". Tārīk͟h-e ʾElm: Iranian Journal for the History of Science. 6: 1–36.

uga.edu

jwilson.coe.uga.edu

Panapoi, Ronnachai, "Some properties of the orthocenter of a triangle", University of Georgia.

web.archive.org

Clark Kimberling's Encyclopedia of Triangle Centers "Encyclopedia of Triangle Centers". Archived from the original on 2012-04-19. Retrieved 2012-04-19.
""Orthocenter of a triangle"". Archived from the original on 2012-07-05. Retrieved 2012-05-04.

wolfram.com

mathworld.wolfram.com

Weisstein, Eric W. "Isotomic conjugate" From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/IsotomicConjugate.html
Weisstein, Eric W. "Orthocenter." From MathWorld--A Wolfram Web Resource.
Weisstein, Eric W. "Kiepert Parabola." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/KiepertParabola.html
Weisstein, Eric W. "Jerabek Hyperbola." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/JerabekHyperbola.html

zenodo.org

Davies, Thomas Stephens (1850). "XXIV. Geometry and geometers" (PDF). Philosophical Magazine. 3. 37 (249): 198–212. doi:10.1080/14786445008646583. Footnote on pp. 207–208. Quoted by Bogomolny, Alexander (2010). "A Possibly First Proof of the Concurrence of Altitudes". Cut The Knot. Retrieved 2019-11-17.