[b][size=150]Friday, February 15th, 2019 [br]9:30 am [/size][/b][br][table] [tr] [td][br] Petra Surynková[br]  [br][/td] [td][br] presentation[br][br] [/td] [td][br] [br]GeoGebra and spatial geometry[br][br] [/td] [/tr] [tr] [td][br]Celina Abar[br][br] [/td] [td][br] presentation[br][br] [/td] [td][br] [br] Study Quadric Surfaces: a proposal using GeoGebra 3D-printed[br] materials[br][br]  [br][br] [/td] [/tr] [tr] [td][br] Diogo Castro[br][br] [/td] [td][br] poster[br][br] [/td] [td][br] Gifmath: educative website for geometry learning and teaching[br][br] Gifmath: website educativo para o ensino e aprendizagem da geometria[br][br] [/td] [/tr] [tr] [td][br] Greg[br] Cruz Silva[br][br] [/td] [td][br] poster[br][br] [/td] [td][br] 2nd Degree Inequalities: An attempt to demystify their approach by constructing changes of records and treatments in the learning of Content with the aid of Geogebra[br][br] [/td] [/tr] [tr] [td][br]Katarzyna Winkowska-Nowak[br][br] [/td] [td][br] presentation[br][br] [/td] [td][br] GeoGebra in Poland: challenges in managing relevant online materials for Polish teachers [br][br] [/td] [/tr] [tr] [td]  [br]Valerian Antohe, [br]Mircea Crisnic[br][br][br][br] [/td] [td]presentation[br][br] [/td] [td][br][br]Ten Years with[br]GeoGebra[br][br][br]  [br][br] [/td] [/tr][/table][br][br]