Tạp chí Hình học Geometricorum

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Circle chains inscribed in symmetrical lunes and integer sequences - Giovanni Lucca

LTTK CTV, 10/10/19

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253

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10/10/19
The golden ratio and regular polygons - Manfred Pietsch

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359

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A toroidal approach to the Archimedean quadrature - Gera T. Soldatos

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231

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A note on conic sections and tangent circles - Jan Kristian Haugland

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243

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10/10/19
Iterated harmonic divisions and the golden ratio - Frank Leitenberger

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325

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10/10/19
Circle chains inscribed in symmetrical lenses and integer sequences - Giovanni Lucca

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237

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10/10/19
A generalization of Droz-Farny's line theorem with orthologic triangles - Ngo Quang Duong and Vu Thanh Tung

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254

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How to compute a triangle with prescribed lengths of its internal angle bisectors - Gerhard Heindl

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266

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10/10/19
On the existence of a triangle with prescribed bisector lengths - Sergey F. Osinkin

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225

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10/10/19
Minimal proof of a generalized Droz-Farny theorem - Grégoire Nicollier

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290

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10/10/19
A group theoretic interpretation of Poncelet's theorem - Albrecht Hess, Daniel Perrin, and Mehdi Trense

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271

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10/10/19
Distances among the Feuerbach points - Sándor N. Kiss

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311

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10/10/19
Euler line in the golden rectangle - Tran Quang Hung

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232

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10/10/19
On a new generalization of the Droz-Farny line - Cyril Letrouit

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309

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10/10/19
Some monotonicity results related to the Fermat point of a triangle - Toufik Mansour and Mark Shattuck

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218

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Two six-circle theorems for cyclic pentagons - Grégoire Nicollier

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229

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Another synthetic proof of the butterfly theorem using the midline in triangle - Tran Quang Hung

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284

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10/10/19
The 19 congruent Jacobi triangles - Glenn T. Vickers

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228

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A proof of the butterfly theorem using the similarity factor of the two wings - Martin Celli

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261

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A characterization of the rhombus - Paris Pamfilos

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241

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Apollonian circumcircles of IFS fractals - Jozsef Vass

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312

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10/10/19
A strengthened version of the Erdos-Mordell inequality - Dao Thanh Oai, Nguyen Tien Dung and Pham Ngoc Mai

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234

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10/10/19
Similarities on a sphere - Pascal Honvault

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245

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The Feuerbach point and the Fuhrmann triangle - Nguyen Thanh Dung

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353

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10/10/19
Euclidean figures and solids without incircles or inspheres - Dimitris M. Christodoulou

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223

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A distance property of the Feuerbach point and its extension - Sándor N. Kiss

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263

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Regular polygons and the golden section - Djura Paunić and Paul Yiu

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217

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10/10/19
Some golden sections in the equilateral and right isosceles triangles - Dao Thanh Oai

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226

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Locus of centroids of similar inscribed triangles - Francisco Javier García Capitán

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239

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Some collinearities in the heptagonal triangle - Abdilkadir Altintaş

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248

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Cevian projections of inscribed triangles and generalized Wallace lines - Gotthard Weise

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243

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10/10/19
Area of the orthic quadrilaterals of a convex cyclic orthodiagonal quadrilateral - Grégoire Nicollier

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229

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Regular polytopic distances - Poo-Sung Park

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225

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On the diagonal and inscribed pentagons of a pentagon - Paris Pamfilos

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245

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10/10/19
Septic equations are solvable by 2-fold origami - Joachim König and Dmitri Nedrenco

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255

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10/10/19
Some loci in the animation of a Sangaku diagram - Junghyun Lee, Minyoung Hwang, and Cheolwon Bae

LTTK CTV, 10/10/19

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217

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A proof of the butterfly theorem using Ceva's theorem - Cesare Donolato

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218

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A recursive formula for the circumradius of the n-simplex - Kenta Kobayashi

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247

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Isogonal conjugacy through a fixed point theorem - Sándor N. Kiss and ZoltánKovács

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236

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10/10/19
A special case of Poncelet's problem - Arthur Holshouser, Stanislav Molchanov, and Harold Reiter

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255

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Applying Poncelet's theorem to the pentagon and the pentagonal star - Arthur Holshouser, Stanislav Molchanov, and Harold Reiter

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290

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A quadrilateral half-turn theorem - Igor Minevich and Patrick Morton

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240

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10/10/19
Ascending lines in the hyperbolic plane - Dieter Ruoff

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240

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10/10/19
Golden sections of triangle centers in the golden triangles - Emmanuel A. J. García and Paul Yiu

LTTK CTV, 10/10/19

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230

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10/10/19
The triangle construction - Paris Pamfilos

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237

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10/10/19
A strong triangle inequality in hyperbola geometry - Csaba Biró and Robert C. Powers

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236

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9/10/19
The golden section in a planar quasi twelve-point star - Hartmut Warm

LTTK CTV, 9/10/19

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248

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9/10/19
Solutions of two Japanese ellipse problems - J. Marshall Unger

LTTK CTV, 9/10/19

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248

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9/10/19
Wernick's list with a final update - Pascal Schreck, Pascal Mathis, Vesna Marinkovic, and Predrag Janicic

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289

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A ladder ellipse problem - Alan Horwitz

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216

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9/10/19
Archimedes' arbelos to the n-th dimension - Antonio M. Oller-Marcén

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224

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9/10/19
Isogonal conjugates in a tetrahedron - Jawad Sadek, Magid Bani-Yaghoub and Noah H. Rhee

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258

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9/10/19
Trisecting an angle correctly up to arcminute - Joseph Tonien

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235

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9/10/19
Geogebra construction of the roots of quadratic, cubic and quartic equations - Nikolaos Dergiades

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250

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9/10/19
Integral right triangle and rhombus pairs with a common area and a common perimeter - Shane Chern

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233

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Two pairs of Archimedean circles derived from a square - Hiroshi Okumura

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223

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9/10/19
On the coincidences of Pascal lines - Jaydeep Chipalkatti

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244

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9/10/19
Some remarks on a Sangaku from Chiba - Paris Pamfilos

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289

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Some theorems on polygons with one-line spectral proofs - Grégoire Nicollier

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231

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A simple dynamic localization of the gravitational center of a triangle - Grégoire Nicollier

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238

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9/10/19
Transforming tripolar into barycentric coordinates - Albrecht Hess

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251

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9/10/19
Topological treatment of Platonic, Archimedean, and related polyhedra - Tom M. Apostol and Mamikon A. Mnatsakanian

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256

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9/10/19
A Study of Risala al-Watar wa'l Jaib (The Treatise on the Chord and Sine) - Mohammed K. Azarian

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221

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Circle incidence theorems - J. Chris Fisher, Eberhard M. Schröder, and Jan Stevens

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238

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Construction of Ajima circles via centers of similitude - Nikolaos Dergiades

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241

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9/10/19
The Kariya problem and related constructions - Paul Yiu

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316

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Pairs of cocentroidal inscribed and circumscribed triangles - Gotthard Weise

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224

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Reciprocal Jacobi triangles and the McCay cubic - Glenn T. Vickers

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251

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9/10/19
Points on a line that maximize and minimize the ratio of the distances to two given points - Arie Bialostocki and Rob Ely

LTTK CTV, 9/10/19

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276

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9/10/19
Another construction of the Simson lines through a given point - Francisco Javier Garcia Capitan

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234

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9/10/19
On a flawed, 16th-century derivation of Brahmagupta's formula for the area of a cyclic quadrilateral - Eisso Atzema

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271

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Do dogs play with rulers and compasses - Li Zhou

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231

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9/10/19
About two characteristic points concerning two nested circles and their use in research of bicentric polygons - Mirko Radic

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271

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Another archimedean circle in an arbelos - Emmanuel Antonio Jose Garcia

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266

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9/10/19
Lemniscates and a locus related to a pair of median and symmedian - Francisco Javier Garcia Capitan

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232

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Two conjectures of Victor Thebault linking tetrahedra with quadrics - Blas Herrera

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293

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Equilateral triangles and Kiepert perspectors in complex numbers - Dao Thanh Oai

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279

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Bounds for elements of a triangle expressed by R, r, s - Temistocle Birsan

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256

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Reflections on Poncelet's pencil - Roger C. Alperin

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226

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9/10/19
The golden section in the inscribed square of an isosceles right triangle - Tran Quang Hung

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249

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9/10/19
From electrostatic potentials to yet another triangle center - Hrvoje Abraham and Vjekoslav Kovac

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307

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9/10/19
Volumes of solids swept tangentially around general surfaces - Tom M. Apostol and Mamikon A. Mnatsakanian

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222

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9/10/19
Volumes of solids swept tangentially around cylinders - Tom M. Apostol and Mamikon A. Mnatsakanian

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219

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9/10/19
Heronian triangles of class K: congruent incircles cevian perspective - Frank M. Jackson and Stalislav Takhaev

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223

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Generalized Tucker circles - Nikolaos Dergiades

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237

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9/10/19
Generalized Archimedean arbelos twins - Nikolaos Dergiades

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248

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9/10/19
Some circles associated with the Feuerbach points - Nguyen Thanh Dung

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228

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9/10/19
Congruent contiguous excircles - Mihaly Bencze and Ovidiu T. Pop

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238

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9/10/19
On a circle containing the incenters of tangential quadrilaterals - Albrecht Hess

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234

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9/10/19
The diagonal point triangle revisited - Martin Josefsson

LTTK CTV, 9/10/19

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231

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9/10/19
Optimal packings of two ellipses in a square - Thierry Gensane and Pascal Honvault

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242

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9/10/19
Archimedean circles related to the Schoch line - Hiroshi Okumura

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232

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9/10/19
On two triads of triangles associated with the perpendicular bisectors of the sides of a triangle - Shao-Cheng Liu

LTTK CTV, 9/10/19

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268

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9/10/19
A gallery of conics by five elements - Paris Pamfilos

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242

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9/10/19
The triangle of reflections - Jesus Torres

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228

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9/10/19
A purely synthetic proof of Dao's theorem on six circumcenters associated with a cyclic hexagon - Telv Cohl

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245

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9/10/19
Three constructions of Archimedean circles in an arbelos - Paul Yiu

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224

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9/10/19
A special point in the arbelos leading to a pair of Archimedean circles - Floor van Lamoen

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240

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Two more pairs of Archimedean circles in the arbelos - Tran Quang Hung

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284

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Two tangent circles from jigsawing quadrangle - Tran Quang Hung

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263

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9/10/19

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