Improving Students’ Understanding of Mathematical Concepts Through Problem-Based Learning Held Geoboard on Plane Figures. JISIP (Jurnal Ilmu Sosial dan Pendidikan), [S. l.], v. 10, n. 3, p. 2155–2161, 2026. DOI: 10.58258/98v3v619. Disponível em: https://ejournal.mandalanursa.org/index.php/JISIP/article/view/10985. Acesso em: 19 sep. 2026.