Theoretical Basis: The van Hiele Model.- Theoretical Framework: Learning as Communicating, Sfard's Discursive Framework, and the Levels of Geometric Discourse.- Methodology: Participants, the van Hiele Geometry Test, Interview Tasks.- Data Collection and Analysis.- Results from the van Hiele Geometry Test and One-on-One Interviews.- Changes in van Hiele Levels and Changes in Geometric Discourse.
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