Mendoza Velazco, Derling José. “Trigonometric Circular Geoplany: A Didactic Resource for the Teaching of Geometry.”. Divulgaciones Matemáticas 19, no. 2 (June 29, 2018): 65-81. Accessed December 6, 2025. https://produccioncientificaluz.org/index.php/divulgaciones/article/view/36613.