PASCA, Philips Pasca G Siagian. THE ANALYSIS OF DIFFICULTY OF STUDENT’S GEOMETRY PROBLEM SOLVING BASED ON VAN HIELE’S THINKING THEORY WITH MACROMEDIA FLASH. Advances in Social Sciences Research Journal, [S. l.], v. 6, n. 7, p. 310–323, 2019. DOI: 10.14738/assrj.67.6848. Disponível em: https://scholarpublishing.org/journals/index.php/ASSRJ/article/view/3594. Acesso em: 28 may. 2026.