Vicente, Fillipe Walis Lima, Rieuse Lopes, Saulo Macedo de Oliveira, and Janine Freitas Mota. “Why Does the Trigonometric Circle Have a Radius of 1? Solving Trigonometric Problems in the Light of Conceptual Fields Theory ”. Revista Paranaense de Educação Matemática 14, no. 34 (August 31, 2025): 01–21. Accessed October 12, 2026. https://periodicos-hml.unespar.edu.br/rpem/article/view/10401.