This article aims to examine the impact of an online learning environment enriched with computer activities on geometry achievement and geometric habits of mind (GHoM). The study includes reflections from an online application of a one-term computer-aided mathematics teaching course in which the participants were preservice teachers (PTs) enrolled in a faculty of education. A test was used to measure all participating PTs’ learning outcome and determine their GHoM. In addition, clinical interviews were administered before and after the intervention to examine the opinions of the PTs regarding the online learning environment. The results revealed that the design provided for positive development in terms of both geometry achievement and GHoM. However, the impact was found to be very limited for some components of GHoM. The article presents a discussion of the effective aspects of the intervention.
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