“…Based on the results of studies from TIMSS (Trends in International Mathematics and Science Study) in 2011, Indonesia ranked very low below the average and far behind neighboring countries such as Singapore, Malaysia, and Thailand (Hadi & Novaliyosi, 2019;Jupri et al, 2014; Indomath: Indonesia Mathematics Education -Volume 3 | Issue 2 | 2020 101 2018,2012). This is due to the lack of student understanding in reasoning and problem solving so that students are less able to solve problems related to reasoning and problem solving, especially in geometry problems (Kattou et al, 2013;Mitchelmore & White, 2004;Uzun & Arslan, 2009). Besides that, based on facts in the community, learning is only as a benchmark to achieve grades not based on how students understand and solve the problems given.…”