Olkun, SinanSinoplu, N. BeylemDeryakulu, Deniz2019-04-242019-04-242005http://hdl.handle.net/20.500.12575/63390The purpose of this paper is to present classroom-tested geometry activities based on the van Hiele geometric thinking levels using dynamic geometry applications. The other ideas behind the activities include teacher questioning, active student participation, and studentcentered decision-making. During the lessons student teachers engaged in self-exploration and reinvention of geometric relations. It was evident from the episodes that students raised their level of geometric thinking by building on their current geometric understanding.endynamic geometryvan Hiele levelsteacher questioningArticle