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    Takhaev, Stalislav
      (with F. M. Jackson) Heronian triangles of class K: a congruent incircles perspective, 15 (2015) 5--12.
    Thas, Charles
      On some remarkable concurrences, 2 (2002) 147--149.
      A generalization of the Lemoine point, 3 (2003) 161--167.
      On the Schiffler point, 4 (2004) 85--95.
      A note on the Droz-Farny theorem, 6 (2006) 25--28.
      The Droz-Farny theorem and related topics, 6 (2006) 235--240.
    Tien, Li C.
      Three pairs of congruent circles in a circle, 4 (2004) 117--124.
    Tong, Jingcheng
      (with S. Kung) A simple construction of the golden ratio, 7 (2007) 31--32.
    Tonien, Joseph
      Trisecting an angle correctly up to arcminute, 16 (2016) 37--41.
    Torrejon, Ricardo M.
      On an Erdos inscribed triangle inequality, 5 (2005) 137--141.
    Torres, Jesus
      The triangle of reflections, 14 (2014) 265--294.
    Tran, Max A.
      Intersecting circles and their inner tangent circle, 6 (2006) 297--300.
    Tran, Quang Hung
      Two tangent circles from jigsawing quadrangle, 14 (2014) 247--248.
      Two more pairs of Archimedean circles in the arbelos, 14 (2014) 249--251.
      The golden section in the inscribed square of an isosceles right triangle, 15 (2015) 91--92.
      Another synthetic proof of the butterfly theorem using the midline in triangle, 16 (2016) 345--346.
      Euler line in the golden rectangle, 16 (2016) 371--372.
      Another simple construction of the golden section with equilateral triangles, 17 (2017) 47--48.
      A simple synthetic proof of Lemoine's theorem, 17 (2017) 93--96.
      Another simple construction of the golden ratio in an isosceles triangle, 17 (2017) 287--288.
    Trense, Mehdi
      (with A. Hess and D. Perrin) A group theoretic interpretation of Poncelet's theorem -- the real case, 16 (2016) 381--395.
    Tsukerman, Emmanuel
      (with O. Radlo) The perpendicular bisector construction, isotopic point and Simson line, 12 (2012) 161--189.
      On polygons admitting a Simson line as discrete analogs of parabolas, 13 (2013) 197--208.
    Tyszka, Apoloniusz
      Steinhaus' problem on partition of a triangle, 7 (2007) 181--185.