Tạp chí Hình học Geometricorum

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  1. LTTK CTV

    Another simple construction of the golden section - Michel Bataille

    LTTK CTV, Oct 9, 2019
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    LTTK CTV
    Oct 9, 2019
  2. LTTK CTV

    A simple construction of the golden section - Jo Niemeyer

    LTTK CTV, Oct 9, 2019
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    315
    LTTK CTV
    Oct 9, 2019
  3. LTTK CTV

    Triangles with given incircle and centroid - Paris Pamfilos

    LTTK CTV, Oct 9, 2019
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    308
    LTTK CTV
    Oct 9, 2019
  4. LTTK CTV

    Translation of Fuhrmann's Sur un nouveau cercle associe a un triangle - Jan Vonk and J. Chris Fisher

    LTTK CTV, Oct 9, 2019
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    316
    LTTK CTV
    Oct 9, 2019
  5. LTTK CTV

    The incenter and an excenter as solutions to an extremal problem - Arie Bialostocki and Dora Bialostocki

    LTTK CTV, Oct 9, 2019
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    304
    LTTK CTV
    Oct 9, 2019
  6. LTTK CTV

    The circles of Lester, Evans, Parry, and their generalizations - Paul Yiu

    LTTK CTV, Oct 9, 2019
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    300
    LTTK CTV
    Oct 9, 2019
  7. LTTK CTV

    Characterizations of bicentric quadrilaterals - Martin Josefsson

    LTTK CTV, Oct 9, 2019
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    399
    LTTK CTV
    Oct 9, 2019
  8. LTTK CTV

    On the Euler reflection point - Cosmin Pohoata

    LTTK CTV, Oct 9, 2019
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    451
    LTTK CTV
    Oct 9, 2019
  9. LTTK CTV

    Integer triangles with R/r = N - Allan MacLeod

    LTTK CTV, Oct 9, 2019
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    LTTK CTV
    Oct 9, 2019
  10. LTTK CTV

    Construction with inscribed ellipses in a triangle - Nikolaos Dergiades

    LTTK CTV, Oct 9, 2019
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    LTTK CTV
    Oct 9, 2019
  11. LTTK CTV

    Trilinear distance inequalities for the symmedian point, the centroid, and other triangle centers - Clark Kimberling

    LTTK CTV, Oct 9, 2019
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    383
    LTTK CTV
    Oct 9, 2019
  12. LTTK CTV

    Generalized Fibonacci circle chains - Giovanni Lucca

    LTTK CTV, Oct 9, 2019
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    349
    LTTK CTV
    Oct 9, 2019
  13. LTTK CTV

    Calculations concerning the tangent lengths and tangency chords of a tangential quadrilateral - Martin Josefsson

    LTTK CTV, Oct 9, 2019
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    390
    LTTK CTV
    Oct 9, 2019
  14. LTTK CTV

    Iterates of Brocardian points and lines - Gotthard Weise

    LTTK CTV, Oct 9, 2019
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    318
    LTTK CTV
    Oct 9, 2019
  15. LTTK CTV

    Three maximal cyclic quadrangles - Paris Pamfilos

    LTTK CTV, Oct 9, 2019
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    321
    LTTK CTV
    Oct 9, 2019
  16. LTTK CTV

    Diophantine Steiner triples and Pythagorean-type triangles - Bojan Hvala

    LTTK CTV, Oct 9, 2019
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    330
    LTTK CTV
    Oct 9, 2019
  17. LTTK CTV

    Orthic quadrilaterals of a convex quadrilateral - Maria Flavia Mammana, Biagio Micale and Mario Pennisi

    LTTK CTV, Oct 9, 2019
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    301
    LTTK CTV
    Oct 9, 2019
  18. LTTK CTV

    Simple relations regarding the Steiner inellipse of a triangle - Benedetto Scimemi

    LTTK CTV, Oct 9, 2019
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    314
    LTTK CTV
    Oct 9, 2019
  19. LTTK CTV

    Conics tangent at the vertices to two sides of a triangle - Nikolaos Dergiades

    LTTK CTV, Oct 9, 2019
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    304
    LTTK CTV
    Oct 9, 2019
  20. LTTK CTV

    Some triangle centers associated with the circles tangent to the excircles - Boris Odehnal

    LTTK CTV, Oct 9, 2019
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    286
    LTTK CTV
    Oct 9, 2019
  21. LTTK CTV

    On the inradius of a tangential quadrilateral - Martin Josefsson

    LTTK CTV, Oct 9, 2019
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    309
    LTTK CTV
    Oct 9, 2019
  22. LTTK CTV

    A maximal parallelogram characterization of ovals having circles as orthoptic curves - Nicolae Anghel

    LTTK CTV, Oct 9, 2019
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    315
    LTTK CTV
    Oct 9, 2019
  23. LTTK CTV

    The Poncelet pencil of rectangular hyperbolas - Roger C. Alperin

    LTTK CTV, Oct 9, 2019
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    307
    LTTK CTV
    Oct 9, 2019
  24. LTTK CTV

    A new proof of a hard but important Sangaku problem - J. Marshall Unger

    LTTK CTV, Oct 9, 2019
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    418
    LTTK CTV
    Oct 9, 2019
  25. LTTK CTV

    A triad of similar triangles associated with the perpendicular bisectors of the sides of a triangle - Quang Tuan Bui

    LTTK CTV, Oct 9, 2019
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    359
    LTTK CTV
    Oct 9, 2019
  26. LTTK CTV

    Reflections in triangle geometry - Antreas P. Hatzipolakis and Paul Yiu

    LTTK CTV, Oct 9, 2019
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    450
    LTTK CTV
    Oct 9, 2019
  27. LTTK CTV

    Trilinear polars of Brocardians - Francisco Javier Garcia Capitan

    LTTK CTV, Oct 9, 2019
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    317
    LTTK CTV
    Oct 9, 2019
  28. LTTK CTV

    A sequence of triangles and geometric inequalities - Dan Marinescu, Mihai Monea, Mihai Opincariu and Marian Stroe

    LTTK CTV, Oct 9, 2019
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    379
    LTTK CTV
    Oct 9, 2019
  29. LTTK CTV

    Pythagorean triangles with square of perimeter equal to an integer multiple of area - John F. Goehl

    LTTK CTV, Oct 9, 2019
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    312
    LTTK CTV
    Oct 9, 2019
  30. LTTK CTV

    On the construction of a triangle from the feet of its angle bisectors - Alexey V. Ustinov

    LTTK CTV, Oct 9, 2019
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    302
    LTTK CTV
    Oct 9, 2019
  31. LTTK CTV

    On the possibility of trigonometric proofs of the Pythagorean theorem - Jason Zimba

    LTTK CTV, Oct 9, 2019
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    298
    LTTK CTV
    Oct 9, 2019
  32. LTTK CTV

    Ten concurrent Euler lines - Nikolai Ivanov Beluhov

    LTTK CTV, Oct 9, 2019
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    LTTK CTV
    Oct 9, 2019
  33. LTTK CTV

    Some triangle centers associated with the tritangent circles - Nikolas Dergiades and Juan Carlos Salazar

    LTTK CTV, Oct 9, 2019
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    294
    LTTK CTV
    Oct 9, 2019
  34. LTTK CTV

    Conic homographies and bitangent pencils - Paris Pamfilos

    LTTK CTV, Oct 9, 2019
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    339
    LTTK CTV
    Oct 9, 2019
  35. LTTK CTV

    A simple barycentric coordinates formula - Nikolaos Dergiades

    LTTK CTV, Oct 9, 2019
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    344
    LTTK CTV
    Oct 9, 2019
  36. LTTK CTV

    On the construction of regular polygons and generalized Napoleon vertices - Dimitris Vartziotis and Joachim Wipper

    LTTK CTV, Oct 9, 2019
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    360
    LTTK CTV
    Oct 9, 2019
  37. LTTK CTV

    Class preserving dissections of convex quadrilaterals - Dan Ismailescu and Adam Vojdany

    LTTK CTV, Oct 9, 2019
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    301
    LTTK CTV
    Oct 9, 2019
  38. LTTK CTV

    On three circles - David Graham Searby

    LTTK CTV, Oct 9, 2019
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    380
    LTTK CTV
    Oct 9, 2019
  39. LTTK CTV

    Circle chains inside a circular segment - Giovanni Lucca

    LTTK CTV, Oct 9, 2019
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    350
    LTTK CTV
    Oct 9, 2019
  40. LTTK CTV

    A family of quartics associated with a triangle - Peter Yff

    LTTK CTV, Oct 9, 2019
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    313
    LTTK CTV
    Oct 9, 2019
  41. LTTK CTV

    An angle bisector parallel applied to triangle construction - Harold Connelly and Beata Randrianantoanina

    LTTK CTV, Oct 9, 2019
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    308
    LTTK CTV
    Oct 9, 2019
  42. LTTK CTV

    On trigonometric proofs of the Steiner-Lehmus theorem - Robert Olah-Gal and Jozsef Sandor

    LTTK CTV, Oct 9, 2019
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    319
    LTTK CTV
    Oct 9, 2019
  43. LTTK CTV

    The symmedian point and concurrent antiparallel images - Shao-Cheng Liu

    LTTK CTV, Oct 9, 2019
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    578
    LTTK CTV
    Oct 9, 2019
  44. LTTK CTV

    Heptagonal triangles and their companions - Paul Yiu

    LTTK CTV, Oct 7, 2019
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    341
    LTTK CTV
    Oct 7, 2019
  45. LTTK CTV

    A note on the anticomplements of the Fermat points - Cosmin Pohoata

    LTTK CTV, Oct 7, 2019
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    367
    LTTK CTV
    Oct 7, 2019
  46. LTTK CTV

    Characterizations of a tangential quadrilateral - Nicusor Minculete

    LTTK CTV, Oct 7, 2019
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    374
    LTTK CTV
    Oct 7, 2019
  47. LTTK CTV

    An extension of triangle constructions from located points - Harold Connelly

    LTTK CTV, Oct 7, 2019
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    347
    LTTK CTV
    Oct 7, 2019
  48. LTTK CTV

    Folding a square to identify two adjacent sides - Cristinel Mortici

    LTTK CTV, Oct 7, 2019
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    299
    LTTK CTV
    Oct 7, 2019
  49. LTTK CTV

    On the Newton line of a quadrilateral - Paris Pamfilos

    LTTK CTV, Oct 7, 2019
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    315
    LTTK CTV
    Oct 7, 2019
  50. LTTK CTV

    Rings of squares around orthologic triangles - Zvonko Cerin

    LTTK CTV, Oct 7, 2019
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    287
    LTTK CTV
    Oct 7, 2019
  51. LTTK CTV

    The Feuerbach point and reflections of the Euler line - Jan Vonk

    LTTK CTV, Oct 7, 2019
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    416
    LTTK CTV
    Oct 7, 2019
  52. LTTK CTV

    On integer relations between the area and perimeter of Heron triangles - Allan J. MacLeod

    LTTK CTV, Oct 7, 2019
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    308
    LTTK CTV
    Oct 7, 2019
  53. LTTK CTV

    Mappings associated with vertex triangles - Clark Kimberling

    LTTK CTV, Oct 7, 2019
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    333
    LTTK CTV
    Oct 7, 2019
  54. LTTK CTV

    The lost daughters of Gergonne - Steve Butler

    LTTK CTV, Oct 7, 2019
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    332
    LTTK CTV
    Oct 7, 2019
  55. LTTK CTV

    On n-sections and reciprocal quadrilaterals - Eisso J. Atzema

    LTTK CTV, Oct 7, 2019
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    286
    LTTK CTV
    Oct 7, 2019
  56. LTTK CTV

    A generalization of Thebault's theorem on the concurrency of three Euler lines - Shao-Cheng Liu

    LTTK CTV, Oct 7, 2019
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    388
    LTTK CTV
    Oct 7, 2019
  57. LTTK CTV

    An elementary proof of a theorem by Emelyanov - Eisso J. Atzema

    LTTK CTV, Oct 7, 2019
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    330
    LTTK CTV
    Oct 7, 2019
  58. LTTK CTV

    A purely geometric proof of the uniqueness of a triangle with prescribed angle bisectors - Victor Oxman

    LTTK CTV, Oct 7, 2019
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    302
    LTTK CTV
    Oct 7, 2019
  59. LTTK CTV

    On the Nagel line and a prolific polar triangle - Jan Vonk

    LTTK CTV, Oct 7, 2019
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    326
    LTTK CTV
    Oct 7, 2019
  60. LTTK CTV

    Second-degree involutory symbolic substitutions - Clark Kimberling

    LTTK CTV, Oct 7, 2019
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    367
    LTTK CTV
    Oct 7, 2019
  61. LTTK CTV

    Some identities arising from inversion of Pappus chains in an arbelos - Giovanni Lucca

    LTTK CTV, Oct 7, 2019
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    293
    LTTK CTV
    Oct 7, 2019
  62. LTTK CTV

    Another compass-only construction of the golden section and of the regular pentagon - Michel Bataille

    LTTK CTV, Oct 7, 2019
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    354
    LTTK CTV
    Oct 7, 2019
  63. LTTK CTV

    A new proof of a weighted Erdos-Mordell type inequality - Yu-Dong Wu

    LTTK CTV, Oct 7, 2019
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    365
    LTTK CTV
    Oct 7, 2019
  64. LTTK CTV

    Stronger forms of the Steiner-Lehmus theorem - Mowaffaq Hajja

    LTTK CTV, Oct 7, 2019
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    332
    LTTK CTV
    Oct 7, 2019
  65. LTTK CTV

    On the generalized Gergonne point and beyond - Miklos Hoffmann and Sonja Gorjanc

    LTTK CTV, Oct 7, 2019
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    345
    LTTK CTV
    Oct 7, 2019
  66. LTTK CTV

    Two more Powerian pairs in the arbelos - Quang Tuan Bui

    LTTK CTV, Oct 7, 2019
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    299
    LTTK CTV
    Oct 7, 2019
  67. LTTK CTV

    Another variation of the Steiner-Lehmus theme - Sadi Abu-Saymeh, Mowaffaq Hajja, and Hassan Ali ShahAli

    LTTK CTV, Oct 7, 2019
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    311
    LTTK CTV
    Oct 7, 2019
  68. LTTK CTV

    On the centroids of polygons and polyhedra - Maria Flavia Mammana, Biagio Micale and Mario Pennisi

    LTTK CTV, Oct 7, 2019
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    295
    LTTK CTV
    Oct 7, 2019
  69. LTTK CTV

    Periodic billiard trajectories in polyhedra - Nicolas Bedaride

    LTTK CTV, Oct 6, 2019
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    301
    LTTK CTV
    Oct 6, 2019
  70. LTTK CTV

    A condition for a circumscriptible quadrilateral to be cyclic - Mowaffaq Hajja

    LTTK CTV, Oct 6, 2019
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    323
    LTTK CTV
    Oct 6, 2019
  71. LTTK CTV

    Means as chords - Francisco Javier Garcia Capitan

    LTTK CTV, Oct 6, 2019
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    309
    LTTK CTV
    Oct 6, 2019
  72. LTTK CTV

    A short proof of Lemoine's theorem - Cosmin Pohoata

    LTTK CTV, Oct 6, 2019
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    344
    LTTK CTV
    Oct 6, 2019
  73. LTTK CTV

    Cubics related to coaxial circles - Bernard Gibert

    LTTK CTV, Oct 6, 2019
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    382
    LTTK CTV
    Oct 6, 2019
  74. LTTK CTV

    An inequality involving the angle bisectors and an interior point of a triangle - Wei-Dong Jiang

    LTTK CTV, Oct 6, 2019
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    308
    LTTK CTV
    Oct 6, 2019
  75. LTTK CTV

    Haruki's lemma and a related locus problem - Yaroslav Bezverkhnyev

    LTTK CTV, Oct 6, 2019
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    448
    LTTK CTV
    Oct 6, 2019
  76. LTTK CTV

    A simple ruler and rusty compass construction of the regular pentagon - Kurt Hofstetter

    LTTK CTV, Oct 6, 2019
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    298
    LTTK CTV
    Oct 6, 2019
  77. LTTK CTV

    Construction of Malfatti squares - Floor van Lamoen and Paul Yiu

    LTTK CTV, Oct 6, 2019
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    362
    LTTK CTV
    Oct 6, 2019
  78. LTTK CTV

    On the Parry reflection point - Cosmin Pohoata

    LTTK CTV, Oct 6, 2019
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    307
    LTTK CTV
    Oct 6, 2019
  79. LTTK CTV

    A short trigonometric proof of the Steiner-Lehmus theorem - Mowaffaq Hajja

    LTTK CTV, Oct 6, 2019
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    312
    LTTK CTV
    Oct 6, 2019
  80. LTTK CTV

    Kronecker theorem and a sequence of triangles - Panagiotis T. Krasopoulos

    LTTK CTV, Oct 6, 2019
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    300
    LTTK CTV
    Oct 6, 2019
  81. LTTK CTV

    Angles, area and perimeter caught in a cubic - George Baloglou and Michel Helfgott

    LTTK CTV, Oct 6, 2019
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    296
    LTTK CTV
    Oct 6, 2019
  82. LTTK CTV

    Two triads of congruent circles from reflections - Quang Tuan Bui

    LTTK CTV, Oct 6, 2019
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    389
    LTTK CTV
    Oct 6, 2019
  83. LTTK CTV

    An affine variant of a Steinhaus problem - Jean-Pierre Ehrmann

    LTTK CTV, Oct 6, 2019
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    313
    LTTK CTV
    Oct 6, 2019
  84. LTTK CTV

    On a construction of Hagge - Christopher Bradley and Geoff Smith

    LTTK CTV, Oct 6, 2019
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    327
    LTTK CTV
    Oct 6, 2019
  85. LTTK CTV

    How pivotal isocubics intersect the circumcircle - Bernard Gibert

    LTTK CTV, Oct 6, 2019
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    296
    LTTK CTV
    Oct 6, 2019
  86. LTTK CTV

    Another verification of Fagnano's theorem - Finbarr Holland

    LTTK CTV, Oct 6, 2019
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    407
    LTTK CTV
    Oct 6, 2019
  87. LTTK CTV

    Cyclic quadrilaterals with prescribed Varignon parallelogram - Michel Bataille

    LTTK CTV, Oct 6, 2019
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    302
    LTTK CTV
    Oct 6, 2019
  88. LTTK CTV

    The Soddy circles - Nikolaus Dergiades

    LTTK CTV, Oct 6, 2019
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    444
    LTTK CTV
    Oct 6, 2019
  89. LTTK CTV

    Constructive solution of a generalization of Steinhaus' problem on partition of a triangle - Jean-Pierre Ehrmann

    LTTK CTV, Oct 6, 2019
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    337
    LTTK CTV
    Oct 6, 2019
  90. LTTK CTV

    Steinhaus' problem on partition of a triangle - Apoloniusz Tyszka

    LTTK CTV, Oct 6, 2019
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    551
    LTTK CTV
    Oct 6, 2019
  91. LTTK CTV

    On a product of two points induced by their cevian triangles - Cosmin Pohoata and Paul Yiu

    LTTK CTV, Oct 6, 2019
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    280
    LTTK CTV
    Oct 6, 2019
  92. LTTK CTV

    Fixed points and fixed lines of Ceva collineations - Clark Kimberling

    LTTK CTV, Oct 6, 2019
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    311
    LTTK CTV
    Oct 6, 2019
  93. LTTK CTV

    Some triangle centers associated with the excircles - Tibor Dosa

    LTTK CTV, Oct 6, 2019
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    322
    LTTK CTV
    Oct 6, 2019
  94. LTTK CTV

    On the diagonals of a cyclic quadrilateral - Claudi Alsina and Roger B. Nelsen

    LTTK CTV, Oct 6, 2019
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    317
    LTTK CTV
    Oct 6, 2019
  95. LTTK CTV

    Coincidence of centers for scalene triangles - Sadi Abu-Saymeh and Mowaffaq Hajja

    LTTK CTV, Oct 6, 2019
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    306
    LTTK CTV
    Oct 6, 2019
  96. LTTK CTV

    Heronian triangles whose areas are integer multiples of their perimeters - Lubomir Markov

    LTTK CTV, Oct 6, 2019
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    293
    LTTK CTV
    Oct 6, 2019
  97. LTTK CTV

    Remarks on Woo's Archimedean circles - Hiroshi Okumura and Masayuki Watanabe

    LTTK CTV, Oct 6, 2019
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    326
    LTTK CTV
    Oct 6, 2019
  98. LTTK CTV

    Characterizations of an infinite set of Archimedean circles - Hiroshi Okumura and Masayuki Watanabe

    LTTK CTV, Oct 6, 2019
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    330
    LTTK CTV
    Oct 6, 2019
  99. LTTK CTV

    The arbelos and nine-point circles - Quang Tuan Bui

    LTTK CTV, Oct 5, 2019
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    322
    LTTK CTV
    Oct 5, 2019
  100. LTTK CTV

    Some more Powerian pairs in the arbelos - Floor van Lamoen

    LTTK CTV, Oct 5, 2019
    Replies:
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    321
    LTTK CTV
    Oct 5, 2019
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