PTOLEMY’S FORMULA FOR CYCLIC QUADRILATERALS. Journal of Multidisciplinary Sciences and Innovations, [S. l.], v. 4, n. 10, p. 440–445, 2025. DOI: 10.55640/. Disponível em: https://ijmri.de/index.php/jmsi/article/view/2700. Acesso em: 3 jun. 2026.