Enhancing Students’ Problem-Solving Skills through Ethnomathematics-Based Geometry Learning with an Android Mobile Application. Riemann: Research of Mathematics and Mathematics Education, [S. l.], v. 8, n. 1, p. 398–411, 2026. DOI: 10.38114/riemann.v8i1.182. Disponível em: https://journal.sanagustin.ac.id/index.php/reimann/article/view/182.. Acesso em: 12 may. 2026.