Improving conceptual understanding in geometry through multimedia instruction: Evidence from a quasi-experimental study. Elementary Mathematics Education Journal, [S. l.], v. 7, n. 1, 2025. DOI: 10.5507/emej2025-7-1-492. Disponível em: https://journals.upol.cz/EMEJ/article/view/492. Acesso em: 14 jun. 2026.