Evgenios Avgerinos & Andreas MarinosOn Using a Dynamic Geometry Software in the Comprehension of the Similarity of Triangles
Grozio Stanilov & Slavka SlavovaModels of the Real Projective Plane and Linear Combination of them
Hiroshi OkumuraGeneralized Non-Archimedean Twin Circles of the Arbelos
Ivanka Marasheva-Delinova & Emil Delinov Motivation of Students for Research Work Using Rotation Bodies Geometry Kliment Vassilev & Donka PashkulevaOn the Concept of a Quadrilateral in the School Geometry Course Masayuki WatanabeCircumscribed and Orthogonal Archimedean Circles in Generalized Arbelos Sava Grozdev & Toni ChehlarovaCongruences in Triangular Nets Stavroula Patsiomitou & Anastassios EmvalotisDeveloping Geometric Thinking Skills Through Dynamic Diagram Transformations Toni Chehlarova & Evgenia SendovaExplorations with Rotational Solids
Kliment Vassilev & Donka PashkulevaOn the Concept of a Quadrilateral in the School Geometry Course
Masayuki WatanabeCircumscribed and Orthogonal Archimedean Circles in Generalized Arbelos
Sava Grozdev & Toni ChehlarovaCongruences in Triangular Nets
Stavroula Patsiomitou & Anastassios EmvalotisDeveloping Geometric Thinking Skills Through Dynamic Diagram Transformations
Toni Chehlarova & Evgenia SendovaExplorations with Rotational Solids