2025-08-072025-08-072022-03-30https://repositorio.ifal.edu.br/handle/123456789/1114This work will show a little of the history of geometry, showing that this science was built from its usefulness, since its origin was due to the day-to-day applications of the people of the time. It will also deal with some of the trajectory and contributions of the mathematician Cláudio Ptolemy, in which he names the theorem that will be referred to, which in turn is little known, but of great importance in the mathematical field, where from it we can obtain several results, including in trigonometric applications which will be demonstrated. And in this way demonstrate the importance of the teacher involving the history of mathematics in his teaching methodology, making students more involved in the teaching-learning process.ptAttribution-NonCommercial-NoDerivs 3.0 BrazilGeometriaTeorema de PtolomeuCláudio PtolomeuGeometryPtolemy's TheoremCláudio PtolomeuTrabalho de Conclusão de CursoCIENCIAS EXATAS E DA TERRA