Forum Geometricorum
Volume 17
(2017)
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1. Jan Kristian Haugland, A note on conic sections and
tangent circles, 1--12.
2. Gera T. Soldatos, A toroidal approach to the
Archimedean quadrature, 13--15.
3. Manfred Pietsch, The golden ratio and regular
polygons, 17--19.
4. Giovanni Lucca, Circle chains inscribed in
symmetrical lunes and integer sequences, 21--29. 5. Chai Wah Wu, Counting the number of isosceles triangles in
rectangular regular grids, 31--39.
6. Giovanni Lucca, Chains of tangent circles inscribed
in a triangle, 41--44. 7. Li Zhou, Do
dogs know the bifurcation locus?, 45--46. 8. Tran Quang Hung, Another simple construction of the golden section
with equilateral triangles, 47--48. 9. Mark Shattuck, Steiner-Lehmus type results related to the Gergonne
point of a triangle, 49--62. 10. Paris Pamfilos, Putting the icosahedron into the octahedron, 63--71.
11. Jaydeep Chipalkatti, Pascal's hexagram
and the geometry of the Ricochet configuration, 73--91. 12. Tran Quang
Hung, A simple synthetic proof of Lemoine's
theorem, 93--95. 13. Elliott A. Weinstein and John D. Klemm, An improved inequality for the perimeter of a
quadrilateral, 97--100. 14. Glenn T. Vickers, Equilateral Jacobi triangles, 101--113. 15.
Martin Celli, Convexity and non-differentiable
singularities in Mortici's paper on Fermat-Torricelli points, 115--117. 16.
Nguyen Tien Dung, Another purely synthetic proof
of Lemoine's theorem, 119--121. 17. Dragutin Svrtan and Darko Veljan, Side lengths of Morley triangles and tetrahedra, 123--142.
18. Paris Pamfilos, Gergonne meets Sangaku, 143--148.
19. Dorin Andrica and Dan Stefan Marinescu, New
interpolation inequalities to Euler's R >= 2r, 149--156. 20. Sandor
N. Kiss and Paul Yiu, On the Tucker circles, 157--175.
21. Prasanna Ramakrishnan, Projective
geometry in relation to the excircles, 177--183. 22. Thomas D.
Maienschein and Michael Q. Rieck, Triangle
constructions based on angular coordinates, 185--195. 23. Dan Stefan
Marinescu and Mihai Monea, About a strengthened
version of Erdos-Mordell inequality, 197--202. 24. Navneel Singhal, On the orthogonality of a median and a symmedian, 203--206.
25. Jorge C. Lucero, On the elementary
single-fold operations of Origami: Reflections and incidence constraints on the
plane, 207--221. 26. David Fraivert, Properties
of the tangents to a circle that forms Pascal points on the sides of a convex
quadrilateral, 223--243. 27. Nikolaos Dergiades and Dimitri M.
Christodoulou, The two incenters of an arbitrary
convex quadrilateral, 245--254. 28. Albrecht Hess, A group theoretic interpretation of Poncelet's
theorem, part 2: the complex case, 255--272. 29. Özcan Gelisgen, On the relations between truncated cuboctahedron,
truncated icosidodecahedron and metrics, 273--285. 30. Tran Quang
Hung, Another simple construction of the golden
section in an isosceles triangle, 287--288. 31. Dasari Naga Vijay
Krishna, On the Feuerbach triangle, 289--300. 32.
Kenzi Sato, Orthocenters of simplices on spheres, 301--324.
33. Manfred Evers, On centers and central
lines of triangles in the elliptic plane, 325--354. 34. Nguyen Tien
Dung, Three synthetic proofs of the Butterfly
Theorem, 355--358. 35. Milorad R. Stevanovic, Predrag B. Petrovic, and
Marina M. Stevanovic, Radii of circles in
Apollonius' problem, 359--372. 36. Todor Zaharinov, The Simson triangle and its properties, 373--381.
37. Dixon J. Jones, The periambic
constellation: Altitudes, perpendicular bisectors, and other radical axes in a
triangle, 383--399. 38. Todor Zaharinov, Orthopoles,
flanks, and Vecten points, 401--410. 39. Jose De la Cruz and John F.
Goehl, Jr., Two interesting integer parameters of
integer-sided triangles, 411--417. 40. Yong Zhang and Jinyao Peng, Heron triangle and rhombus pairs with a common area
and a common perimeter, 419--423. 41. Jawad Sadek, Isogonal conjugates in an n-simplex, 425--432. 42.
Andrei Moldavanov, Classical right-angled
triangles and the golden ratio, 433--437. 43. Andrei Moldavanov, The first sharp gyrotriangle inequality in
M\"{o}bius gyrovector space (D, oplus, otimes), 439--447. 44.
Igor Minevich and Patrick Morton, A cevian locus
and the geometric construction of a special elliptic curve, 449--464. 45.
Dimitri M. Christodoulou, Golden elliptical orbits
in Newtonian gravitation, 465--471. 46. Paris Pamfilos, On some elementary properties of quadrilaterals, 473--482.
47. Kenzi Sato, Orthocenters of simplices in
hyperbolic spaces, 483--508. 48. David Fraivert, Properties of a Pascal points circle in a
quadrilateral with perpendicular diagonals, 509--526. 49. George E.
Lefkaditis, Thomas L. Toulias, and Stelios Markatis, On the circumscribing ellipse of three concentric
ellipses, 527--547. -->