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    Sadek, Jawad
      (with M. Bani-Yaghoub and N. H. Rhee) Isogonal conjugates in a tetrahedron, 16 (2016) 43--50.
    Salazar, Juan Carlos
      (with N. Dergiades) Harcourt's theorem, 3 (2003) 117--124.
      On the areas of the intouch and extouch triangles, 4 (2004) 61--65.
      (with K. L. Nguyen) On the mixtilinear incircles and excircles, 6 (2006) 1--16.
      (with N. Dergiades) Some triangle centers associated with the tritangent circles, 9 (2009) 259--270.
    Sandor, Jozsef
      On the geometry of equilateral triangles, 5 (2005) 107--117.
      (with R. Olah-Gal) On trigonometric proofs of the Steiner-Lehmus theorem, 9 (2009) 155--160.
    Sastry, K. R. S.
      Heron triangles: a Gergonne-cevian-and-median perspective, 1 (2001) 17--24.
      Brahmagupta quadrilaterals, 2 (2002) 167--173.
      Triangles with special isotomic conjugate pairs, 4 (2004) 73--80.
      Construction of Brahmagupta n-gons, 5 (2005) 119--126.
      A Gergonne analogue of the Steiner-Lehmus theorem, 5 (2005) 191--195.
      Two Brahmagupta problems, 6 (2006) 301--310.
    Scheer, Michael J. G.
      A simple vector proof of Feuerbach's theorem, 11 (2011) 205--210.
    Schmidt, Eckart
      Circumcenters of residual triangles, 3 (2003) 207--214.
    Schreck, Pascal
      Wernick's list: a final update, 3 (2016) 69--80.
    Schröder, Eberhard M.
      (with J. C. Fisher and J. Stevens) Circle incidence theorems, 15 (2015) 211--228.
    Scimemi, Benedetto
      Paper-folding and Euler's theorem revisited, 2 (2002) 93--104.
      Simple relations regarding the Steiner inellipse of a triangle, 10 (2010) 55--77.
      Semi-similar complete quadrangles, 14 (2014) 87--106.
    Searby, David Graham
      On three circles, 9 (2009) 181--193.
    Semiao, Paulo
      (with J. Rodriguez and P. Manuel) A conic associated with the Euler line, 6 (2006) 17--23.
    ShahAli, Hassan Ali
      (with S. Abu-Saymeh and M. Hajja) Another variation of the Steiner-Lehmus theme, 8 (2008) 131--140.
    Shattuck, Mark
      (with T. Mansou) On a certain cubic geometric inequality, 11 (2011) 175--181.
      (with T. Mansou) Improving upon a geometric inequality of third order, 12 (2012) 227--235.
      Steiner-Lehmus type results related to the Gergonne point of a triangle, 17 (2017) 49--62.
    Shawyer, Bruce
      Some remarkable concurrences, 1 (2001) 69--74.
    Sigur, Steve
      Where are the conjugates? 5 (2005) 1--15.
    Singer, David A.
      (with J. C. Langer) The lemniscatic chessboard, 11 (2011) 183--199.
    Smith, Geoffrey C.
      Statics and the moduli space of triangles, 5 (2005) 181--190.
      (with C. Bradley) The locations of triangle centers, 6 (2006) 57--70.
      (with C. Bradley) The locations of the Brocard points, 6 (2006) 71--77.
      (with C. Bradley and D. Monk) On a porism associated with the Euler and Droz-Farny lines, 7 (2007) 11--17.
      (with C. Bradley) On a construction of Hagge, 7 (2007) 231--247.
    Spirova, Margarita
      (with M. Hajja) A characterization of the centroid using June Lester's shape function, 6 (2006) 53--55.
    Soldatos, Gerssimos T.
      A toroidal approach to the Archimedean quadrature, 17 (2017) 13--15.
    Stern, Joseph
      Euler's triangle determination problem, 7 (2007) 1--9.
    Stevanovic, Milorad
      Triangle centers associated with the Malfatti circles, 3 (2003) 83--93.
      The Apollonius circle and related triangle centers, 3 (2003) 187--195.
      Two triangle centers associated with the excircles, 3 (2003) 197--203.
    Stevens, Jan
      (with J. C. Fisher and E. M. Schröder) Circle incidence theorems, 15 (2015) 211--228.
    Stothers, Wilson
      Grassmann cubics and desmic structures, 6 (2006) 117--138.
    Stroe, Marian
      (with D. Marinescu, M. Monea and M. Opincariu) A sequence of triangles and geometric inequalities, 9 (2009) 291--295.
    Stupel, Moshe
      (with V. Oxman) Why are the side lengths of the squares inscribed in a triangle so close to each other?, 13 (2013) 113--115.
    Suceava, Bogdan D.
      (with W. G. Boskoff) Applications of homogeneous functions to geometric inequalities and identities in the euclidean plane, 5 (2005) 143--148.
      (with W. G. Boskoff) A projectivity characterized by the Pythagorean relation, 6 (2006) 187--190.
      (with P. Yiu) The Feuerbach point and Euler lines, 6 (2006) 191--197.
      (with W. G. Boskoff and L. H. Odom) An elementary view on Gromov hyperbolic spaces, 12 (2012) 283--286.
      (with W. G. Boskoff and L. Homentcovschi) Gossard's perspector and projective consequences, 13 (2013) 169--184.
    Svrtan, Dragutin
      (with D. Veljan) Non-Euclidean versions of some classical triangle inequalities, 12 (2012) 197--209.
      (with D. Veljan) Side lengths of Morley triangles and tetrahedra, 17 (2017) 123--142.