“…Of the 25 articles studied, there were 12 articles which discussed flat shapes, namely research (Maryati et al, 2019), (Hendri Prayogi, 2019, (E Nur'Aeni et al, 2019), (Suryati & L, 2020), (Komalasari et al, 2021), (Rerev, 2021), (Desrina Hardianti, 2021), (Nurhalimah et al, 2022), (Nopriana et al, 2022), (Widuri, R., Fuadiah, N. F., & Pratama, 2022), (Erika et al, 2022), and (Lestari et al, 2023). From the results of the analysis of each article obtained the following learning obstacles:…”