** Rabinowitz, Stanley
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**Pseudo-incircles, 6 (2006) 107--115. **

**
**** Radic, Mirko
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**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
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** (with E. Tsukerman) The perpendicular bisector construction, isotopic point and Simson line, 12 (2012) 161--189. **

** Ramakrishnan, Prasanna
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**Projective geometry in relation to the excircles, 17 (2017) 177--183.**

**
**** Ramírez, José L.
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**Inversions in an ellipse, 14 (2014) 107--115.**

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**** Randrianantoanina, Beata
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** (with H. Connelly) An angle bisector parallel applied to triangle construction, 9 (2009) 161--163. **

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**** Reiter, Harold
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** (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
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**An application of Th\'ebault's theorem, 2 (2002) 183--183. **

**The Lucas circles and the Descartes formula, 3 (2003) 95--100. **

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**** Rhee, Noah H
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** (with M. Bani-Yaghoub and J. Sadek) Isogonal conjugates in a tetrahedron, 16
(2016) 43--50. **

** Rieck, Michael Q.
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** (with T. D. Maienschein) Triangle constructions based on angular coordinates,
17 (2017) 185--195. **

**
**** Rodriguez, Juan
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** (with P. Manuel and P. Semiao) A conic associated with the Euler line, 6 (2006) 17--23. **

**
**** Rolinek, Michal
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** (with A. D. Le) The Miquel points, pseudocircumcenter, and Euler-Poncelet point of a complete quadrilateral, 14 (2014) 145--153.**

**
**** Ruoff, Dieter
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**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
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** (with T. Gensane) On the maximal inflation of two squares, 5 (2005) 23--31. **

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