A proposal for teaching flat geometry in elementary school: mathematics present in students’ daily lives. Research, Society and Development, [S. l.], v. 9, n. 7, p. e143973931, 2020. DOI: 10.33448/rsd-v9i7.3931. Disponível em: https://www.rsdjournal.org/rsd/article/view/3931. Acesso em: 5 dec. 2025.