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    Calvo, Maria
      (with V. Munoz) The most inaccessible point of a convex domain, 13 (2013) 37--52.
    Celli, Martin
      A proof of the butterfly theorem using the similarity factor of the two wings, 16 (2016) 337--338.
      Convexity and non-differentiable singularities in Mortici's paper on Fermat-Torricelli points, 17 (2017) 115--117.
    Cerin, Zvonko
      Loci related to variable flanks, 2 (2002) 105--113.
      The vertex-midpoint-centroid triangles, 4 (2004) 97--109.
      On butterflies inscribed in a quadrilateral, 6 (2006) 241--246.
      Rings of squares around orthologic triangles, 9 (2009) 57--80.
      On the Fermat geometric problem, 13 (2013) 135--147.
    Chern, Shane
      Integral right triangle and rhombus pairs with a common area and a common perimeter, 16 (2016) 25--27.
    Chipalkatti, Jaydeep
      On the coincidences of Pascal lines, 16 (2016) 1--21.
      Pascal's hexagram and the geometry of the Ricochet configuration, 17 (2017) 73--91.
    Christodoulou, Dmitri M.
      Euclidean figures and solids without incircles or inspheres, 16 (2016) 291--298.
      (with N. Dergiades) The two incenters of an arbitrary convex quadrilateral, 17 (2017) 245--254.
      Golden elliptical orbits in Newtonian gravitation, 17 (2017) 465--471.
    Cipu, Mihai
      Cyclic quadrilaterals associated with squares, 11 (2011) 223--229.
    Cohl, Telv
      A purely synthetic proof of Dao's theorem on six circumcenters associated with a cyclic hexagon, 14 (2014) 261--264.
    Connelly, Harold
      (with N. Dergiades and J. P. Ehrmann) Construction of triangle from a vertex and the feet of two angle bisectors, 7 (2007) 103--106.
      An extension of triangle constructions from located points, 9 (2009) 109--112.
      (with B. Randrianantoanina) An angle bisector parallel applied to triangle construction, 9 (2009) 161--163.