Mathematical Concept Teaching Design based on APOS Theory in the Context of Mathematical History: A Plane Rectangular Coordinate System as an Example. JOURNAL OF TEACHING AND LEARNING IN ELEMENTARY EDUCATION (JTLEE), [S. l.], v. 7, n. 2, p. 172–179, 2024. DOI: 10.33578/. Disponível em: https://jtlee.ejournal.unri.ac.id/index.php/JTLEE/article/view/54. Acesso em: 15 oct. 2025.