Torres, Romi, and Mario Sanchez. “Treatment of the Concept of Angle in Elementary School Textbooks in Chile”. Contextos Educativos. Revista de Educación, no. 32 (October 10, 2023): 289–304. Accessed September 16, 2026. https://publicaciones.unirioja.es/ojs/index.php/contextos/article/view/5149.