“…Indeed, the studies show a significant positive correlation between teacher's knowledge of the teaching strategies and student achievement, with qualified teaching knowledge serving as an important predictor for student's mathematics learning gains (Baumert et al 2010;Carnoy & Arends, 2012). In the literature, there are also studies that point out the problems of teachers in terms of envisaging geometric objects as concepts (Karakuş, 2018), and, due to this, their inefficacy in choosing and implementing relevant teaching strategies (Gökkurt et al, 2016). This ineffectiveness is considered one of the reasons students struggle to cognitively grasp geometric objects and achieve desired learning outcomes (Gökkurt, 2014;Hangül, 2010;Lee & Hollebrands, 2008;Toptaş, 2008).…”