BETWEEN FORMAL AND INFORMAL THINKING: THE USE OF ALGEBRA FOR SOLVING GEOMETRY PROBLEMS FROM THE PERSPECTIVE OF VAN HIELE THEORY. Jurnal Pengajaran Matematika dan Ilmu Pengetahuan Alam, [S. l.], v. 21, n. 2, p. 108–113, 2016. DOI: 10.18269/jpmipa.v21i2.44254. Disponível em: https://ejournal-science.upi.edu/jpmipa/article/view/712. Acesso em: 1 jul. 2026.