Tạp chí Hình học Geometricorum

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Dao's theorem on six circumcenters associated with a cyclic hexagon - Nikolaos Dergiades

LTTK CTV, 9/10/19

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229

LTTK CTV

9/10/19
A note on Haga's theorems in paper folding - Hiroshi Okumura

LTTK CTV, 9/10/19

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244

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9/10/19
A simple property of isosceles triangles with applications - Surajit Dutta

LTTK CTV, 9/10/19

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240

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9/10/19
Quasi-circumcenters and a generalization of the quasi-Euler line to a hexagon - Michael de Villiers

LTTK CTV, 9/10/19

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240

LTTK CTV

9/10/19
Symbolic substitution has a geometric meaning - Manfred Evers

LTTK CTV, 9/10/19

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258

LTTK CTV

9/10/19
On some triads of homothetic triangles - Gotthard Weise

LTTK CTV, 9/10/19

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238

LTTK CTV

9/10/19
Two pairs of Archimedean circles in the arbelos - Dao Thanh Oai

LTTK CTV, 9/10/19

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241

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9/10/19
The Cevian Simson transformation - Bernard Gibert

LTTK CTV, 9/10/19

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236

LTTK CTV

9/10/19
Asymptotic directions of pivotal isocubics - Bernard Gibert

LTTK CTV, 9/10/19

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236

LTTK CTV

9/10/19
Antirhombi - Nikolaos Dergiades

LTTK CTV, 9/10/19

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230

LTTK CTV

9/10/19
A note on reflections - Emmanuel Antonio Jose Garcia

LTTK CTV, 9/10/19

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235

LTTK CTV

9/10/19
The Miquel points, pseudocircumcenter, and Euler-Poncelet point of a complete quadrilateral - Michal Rolinek and Le Anh Dung

LTTK CTV, 9/10/19

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371

LTTK CTV

9/10/19
Properties of equidiagonal quadrilaterals - Martin Josefsson

LTTK CTV, 9/10/19

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244

LTTK CTV

9/10/19
A note on the Fermat-Torricelli point of a class of polygons - Cristinel Mortici

LTTK CTV, 9/10/19

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229

LTTK CTV

9/10/19
A simple proof of Gibert's generalization of the Lester circle theorem - Dao Thanh Oai

LTTK CTV, 9/10/19

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234

LTTK CTV

9/10/19
On a geometric locus in taxicab geometry - Bryan Brzycki

LTTK CTV, 9/10/19

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273

LTTK CTV

9/10/19
Inversions in an ellipse - José L. Ramírez

LTTK CTV, 9/10/19

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214

LTTK CTV

9/10/19
Semi-similar complete quadrangles - Benedetto Scimemi

LTTK CTV, 9/10/19

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285

LTTK CTV

9/10/19
The touchpoints triangles and the Feuerbach hyperbolas - Sándor N. Kiss and Paul Yiu

LTTK CTV, 9/10/19

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233

LTTK CTV

9/10/19
Distances between the circumcenter of the extouch triangle and the classical centers - Marie-Nicole Gras

LTTK CTV, 9/10/19

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219

LTTK CTV

9/10/19
Kitta's double-locked problem - J. Marshall Unger

LTTK CTV, 9/10/19

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320

LTTK CTV

9/10/19
Dynamics of the nested triangles formed by the tops of the perpendicular bisectors - Grégoire Nicollier

LTTK CTV, 9/10/19

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244

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9/10/19
The associated harmonic quadrilateral - Paris Pamfilos

LTTK CTV, 9/10/19

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240

LTTK CTV

9/10/19
Angle and circle characterizations of tangential quadrilaterals - Martin Josefsson

LTTK CTV, 9/10/19

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271

LTTK CTV

9/10/19
A vector-based proof of Morley's trisector theorem - Cesare Donolato

LTTK CTV, 9/10/19

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264

LTTK CTV

9/10/19
Some simple results on cevian quotients - Francisco Javier Garcia Capitan

LTTK CTV, 9/10/19

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243

LTTK CTV

9/10/19
Intersecting equilateral triangles - Colleen Nielsen and Christa Powers

LTTK CTV, 9/10/19

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277

LTTK CTV

9/10/19
Zeyd Yusuf Koroglu and Yigit Yargic, Three natural homoteties of the nine-point circle - Mehmet Efe Akengin

LTTK CTV, 9/10/19

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231

LTTK CTV

9/10/19
On polygons admitting a Simson line as discrete analogs of parabolas - Emmanuel Tsukerman

LTTK CTV, 9/10/19

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230

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9/10/19
A generalization of the Conway circle - Francisco Javier Garcia Capitan

LTTK CTV, 9/10/19

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251

LTTK CTV

9/10/19
A sangaku-type problem with regular polygons, triangles, and congruent incircles - Naoharu Ito and Harald K. Wimmer

LTTK CTV, 9/10/19

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271

LTTK CTV

9/10/19
Gossard's perspector and projective consequences - Wladimir G. Boskoff, Laurentiu Homentcovschi and Bogdan D. Suceava

LTTK CTV, 9/10/19

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282

LTTK CTV

9/10/19
Special inscribed trapezoids in a triangle - Nikolaos Dergiades

LTTK CTV, 9/10/19

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229

LTTK CTV

9/10/19
Pedal polygons - Daniela Ferrarello, Maria Flavia Mammana and Mario Pennisi

LTTK CTV, 9/10/19

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266

LTTK CTV

9/10/19
Jigsawing a quadrangle from a triangle - Floor van Lamoen

LTTK CTV, 9/10/19

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490

LTTK CTV

9/10/19
On the Fermat geometric problem - Zvonko Cerin

LTTK CTV, 9/10/19

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235

LTTK CTV

9/10/19
Derivation of the law of cosines via the incircle - Larry Hoehn

LTTK CTV, 9/10/19

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245

LTTK CTV

9/10/19
Pairings of circles and Sawayama's theorem - Paris Pamfilos

LTTK CTV, 9/10/19

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237

LTTK CTV

9/10/19
Why are the side lengths of the squares inscribed in a triangle so close to each other - Victor Oxman and Moshe Stupel

LTTK CTV, 9/10/19

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279

LTTK CTV

9/10/19
The f-belos - Antonio M. Oller-Marcen

LTTK CTV, 9/10/19

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225

LTTK CTV

9/10/19
On the conic through the intercepts of the three lines through the centroid and the intercepts of a given line - Paul Yiu

LTTK CTV, 9/10/19

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281

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9/10/19
Convolution filters for triangles - Gregoire Nicollier

LTTK CTV, 9/10/19

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238

LTTK CTV

9/10/19
Perpendicular bisectors of triangle sides - Douglas W. Mitchell

LTTK CTV, 9/10/19

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213

LTTK CTV

9/10/19
The most inaccessible point of a convex domain - Maria Calvo and Vicente Munoz

LTTK CTV, 9/10/19

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234

LTTK CTV

9/10/19
Characterizations of trapezoids - Martin Josefsson

LTTK CTV, 9/10/19

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280

LTTK CTV

9/10/19
Five proofs of an area characterization of rectangles - Martin Josefsson

LTTK CTV, 9/10/19

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261

LTTK CTV

9/10/19
Bicentric quadrilaterals through inversion - Albrecht Hess

LTTK CTV, 9/10/19

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249

LTTK CTV

9/10/19
A triad of circles tangent internally to the nine-point circle - Nikolaos Dergiades and Alexei Myakishev

LTTK CTV, 9/10/19

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231

LTTK CTV

9/10/19
Soddyian triangles - Frank M. Jackson

LTTK CTV, 9/10/19

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237

LTTK CTV

9/10/19
The butterfly theorem revisited - Nikolas Dergiades and Sung Hyun Lim

LTTK CTV, 9/10/19

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222

LTTK CTV

9/10/19
On tripolars and parabolas - Paris Pamfilos

LTTK CTV, 9/10/19

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324

LTTK CTV

9/10/19
An elementary view on Gromov hyperbolic spaces - Wladimir G. Boskoff, Lucy H. Odom and Bogdan D. Suceava

LTTK CTV, 9/10/19

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227

LTTK CTV

9/10/19
Generalizing orthocorrespondence - Manfred Evers

LTTK CTV, 9/10/19

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293

LTTK CTV

9/10/19
Using complex weighted centroids to create homothetic polygons - Harold Reiter and Arthur Holshouser

LTTK CTV, 9/10/19

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238

LTTK CTV

9/10/19
Maximal area of a bicentric quadrilateral - Martin Josefsson

LTTK CTV, 9/10/19

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0

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308

LTTK CTV

9/10/19
Improving upon a geometric inequality of third order - Toufik Mansour and Mark Shattuck

LTTK CTV, 9/10/19

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0

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256

LTTK CTV

9/10/19
Sherman's fourth side of a triangle - Paul Yiu

LTTK CTV, 9/10/19

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0

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271

LTTK CTV

9/10/19
The spheres tangent externally to the tritangent spheres of a triangle - Floor van Lamoen

LTTK CTV, 9/10/19

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0

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245

LTTK CTV

9/10/19
Finding integer-sided triangles with P^2 = nA - John F. Goehl

LTTK CTV, 9/10/19

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0

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243

LTTK CTV

9/10/19
Non-Euclidean versions of some classical triangle inequalities - Dragutin Svrtan and Darko Veljan

LTTK CTV, 9/10/19

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218

LTTK CTV

9/10/19
Alhazen's circular billiard problem - Debdyuti Banerjee and Nikolaos Dergiades

LTTK CTV, 9/10/19

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0

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321

LTTK CTV

9/10/19
A highway from Heron to Brahmagupta - Albrecht Hess

LTTK CTV, 9/10/19

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0

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278

LTTK CTV

9/10/19
The perpendicular bisector construction, isotopic point and Simson line - Olga Radko and Emmanuel Tsukerman

LTTK CTV, 9/10/19

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248

LTTK CTV

9/10/19
Harmonic conjugate circles relative to a triangle - Nikolaos Dergiades

LTTK CTV, 9/10/19

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0

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240

LTTK CTV

9/10/19
Some properties of the Newton-Gauss line - Catalin Barbu and Ion Patrascu

LTTK CTV, 9/10/19

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0

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236

LTTK CTV

9/10/19
On the intersections of the incircle and the cevian circumcircle of the incenter - Luis Gonzalez and Cosmin Pohoata

LTTK CTV, 9/10/19

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0

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297

LTTK CTV

9/10/19
Three conics derived from perpendicular lines - Alberto Mendoza

LTTK CTV, 9/10/19

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315

LTTK CTV

9/10/19
Reflection triangles and their iterates - Gregoire Nicollier

LTTK CTV, 9/10/19

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0

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218

LTTK CTV

9/10/19
A new proof of Yun's inequality or bicentric quadrilaterals - Martin Josefsson

LTTK CTV, 9/10/19

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0

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326

LTTK CTV

9/10/19
Similar metric characterizations of tangential and extangential quadrilaterals - Martin Josefsson

LTTK CTV, 9/10/19

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0

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228

LTTK CTV

9/10/19
Properties of valtitudes and vaxes of a convex quadrilateral - Maria Flavia Mammana, Biagio Micale, and Mario Pennisi

LTTK CTV, 9/10/19

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0

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262

LTTK CTV

9/10/19
The isosceles trapezoid and its dissecting similar triangles - Larry Hoehn

LTTK CTV, 9/10/19

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0

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231

LTTK CTV

9/10/19
More integer triangles with R div r=N - John F. Goehl

LTTK CTV, 9/10/19

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0

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227

LTTK CTV

9/10/19
Characterizations of orthodiagonal quadrilaterals - Martin Josefsson

LTTK CTV, 9/10/19

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0

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248

LTTK CTV

9/10/19
Generalization and extension of the Wallace theorem - Gotthard Weise

LTTK CTV, 9/10/19

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0

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234

LTTK CTV

9/10/19
On six circumcenters and their concyclicity - Nikolas Dergiades, Francisco Javier Garcia Capitan, and Sung Hyun Lim

LTTK CTV, 9/10/19

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0

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271

LTTK CTV

9/10/19
Construction of circles through intercepts to paralells to cevians - Jean-Pierre Ehrmann, Francisco Javier Garcia Capitan, and Alexei Myakishev

LTTK CTV, 9/10/19

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0

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288

LTTK CTV

9/10/19
The golden section with a collapsible compass only - Nikolaos Dergiades and Paul Yiu

LTTK CTV, 9/10/19

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0

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233

LTTK CTV

9/10/19
Golden sections in a regular hexagon - Quang Tuan Bui

LTTK CTV, 9/10/19

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220

LTTK CTV

9/10/19
Rational Steiner porism - Paul Yiu

LTTK CTV, 9/10/19

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227

LTTK CTV

9/10/19
The distance from the incenter to the Euler line - William N. Franzsen

LTTK CTV, 9/10/19

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0

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239

LTTK CTV

9/10/19
Cyclic quadrilaterals associated with squares - Mihai Cipu

LTTK CTV, 9/10/19

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0

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237

LTTK CTV

9/10/19
Collinearity of the first trisection points of cevian segments - Francisco Javier Garcia Capitan

LTTK CTV, 9/10/19

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0

Đọc:

251

LTTK CTV

9/10/19
The area of the diagonal point triangle - Martin Josefsson

LTTK CTV, 9/10/19

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0

Đọc:

260

LTTK CTV

9/10/19
A new formula concerning the diagonals and sides of a quadrilateral - Larry Hoehn

LTTK CTV, 9/10/19

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0

Đọc:

244

LTTK CTV

9/10/19
A simple vector proof of Feuerbach's theorem - Michael J. G. Scheer

LTTK CTV, 9/10/19

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0

Đọc:

253

LTTK CTV

9/10/19
A spatial view of the second Lemoine circle - Floor van Lamoen

LTTK CTV, 9/10/19

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0

Đọc:

243

LTTK CTV

9/10/19
The lemniscatic chessboard - Joel C. Langer and David A. Singer

LTTK CTV, 9/10/19

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0

Đọc:

250

LTTK CTV

9/10/19
On a certain cubic geometric inequality - Toufik Mansour and Mark Shattuck

LTTK CTV, 9/10/19

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0

Đọc:

208

LTTK CTV

9/10/19
When is a tangential quadrilateral a kite? - Martin Josefsson

LTTK CTV, 9/10/19

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0

Đọc:

228

LTTK CTV

9/10/19
The area of a bicentric quadrilateral - Martin Josefsson

LTTK CTV, 9/10/19

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0

Đọc:

385

LTTK CTV

9/10/19
On a triad of circles tangent to the circumcircle and the sides at their midpoints - Luis Gonzalez

LTTK CTV, 9/10/19

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0

Đọc:

219

LTTK CTV

9/10/19
More on twin circles of the skewed arbelos - Hiroshi Okumura

LTTK CTV, 9/10/19

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0

Đọc:

229

LTTK CTV

9/10/19
More on the extension of Fermat's problem - Nguyen Minh Ha and Bui Viet Loc

LTTK CTV, 9/10/19

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0

Đọc:

230

LTTK CTV

9/10/19
Solving Euler's triangle problems with Poncelet's pencil - Roger C. Alperin

LTTK CTV, 9/10/19

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0

Đọc:

233

LTTK CTV

9/10/19
The Droz-Farny circles of a convex quadrilateral - Maria Flavia Mammana, Biagio Micale and Mario Pennisi

LTTK CTV, 9/10/19

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0

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276

LTTK CTV

9/10/19
On a theorem of intersecting conics - Darren C. Ong

LTTK CTV, 9/10/19

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0

Đọc:

211

LTTK CTV

9/10/19
Perspective isoconjugate triangle pairs, Hofstadter pairs, and crosssums on the nine-point circle - Peter J. C. Moses and Clark Kimberling

LTTK CTV, 9/10/19

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0

Đọc:

284

LTTK CTV

9/10/19
More characterizations of tangential quadrilaterals - Martin Josefsson

LTTK CTV, 9/10/19

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0

Đọc:

240

LTTK CTV

9/10/19
On the foci of circumparabolas - Michel Bataille

LTTK CTV, 9/10/19

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0

Đọc:

228

LTTK CTV

9/10/19

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