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    Rabinowitz, Stanley
      Pseudo-incircles, 6 (2006) 107--115.
    Radic, Mirko
      Extremes areas of triangles in Poncelet's closure theorem, 4 (2004) 23--26.
      About two characteristic points concerning two nested circles and their use in research of bicentric polygons, 15 (2015) 129--157.
    Radko, Olga
      (with E. Tsukerman) The perpendicular bisector construction, isotopic point and Simson line, 12 (2012) 161--189.
    Ramírez, José L.
      Inversions in an ellipse, 14 (2014) 107--115.
    Randrianantoanina, Beata
      (with H. Connelly) An angle bisector parallel applied to triangle construction, 9 (2009) 161--163.
    Reiter, Harold
      (with A. Holshouser) Using complex weighted centroids to create homothetic polygons, 12 (2012) 247--251.
      (with A. Holshouser and S. Molchanov) Applying Poncelet's theorem to the pentagon and the pentagonal star, 16 (2016) 141--149.
      (with A. Holshouser and S. Molchanov) A special case of Poncelet's problem, 16 (2016) 151--170.
    Reyes, Wilfred
      An application of Th\'ebault's theorem, 2 (2002) 183--183.
      The Lucas circles and the Descartes formula, 3 (2003) 95--100.
    Rhee, Noah H
      (with M. Bani-Yaghoub and J. Sadek) Isogonal conjugates in a tetrahedron, 16 (2016) 43--50.
    Rodriguez, Juan
      (with P. Manuel and P. Semiao) A conic associated with the Euler line, 6 (2006) 17--23.
    Rolinek, Michal
      (with A. D. Le) The Miquel points, pseudocircumcenter, and Euler-Poncelet point of a complete quadrilateral, 14 (2014) 145--153.
    Ruoff, Dieter
      On the generating motions and the convexity of a well-known curve in hyperbolic geometry, 6 (2006) 149--166.
      Ascending lines in the hyperbolic plane, 16 (2016) 125--132.
    Ryckelynck, Philippe
      (with T. Gensane) On the maximal inflation of two squares, 5 (2005) 23--31.