ISWADI, I. Increasing Student’s Learning Activity on Trigonometry Material through a Contextual-Based Group Investigation Learning Model. PPSDP International Journal of Education, [S. l.], v. 3, n. 1, p. 139–146, 2024. DOI: 10.59175/pijed.v3i1.200. Disponível em: https://ejournal.ppsdp.org/pijed/article/view/200. Acesso em: 17 jun. 2026.