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.
Ramakrishnan, Prasanna
Projective geometry in relation to the excircles, 17 (2017) 177--183.
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.
Rieck, Michael Q.
(with T. D. Maienschein) Triangle constructions based on angular coordinates,
17 (2017) 185--195.
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.