https://es.khanacademy.org/math/basic-geo/basic-geometry-pythagorean-theorem/geo-pythagorean-theorem/v/the-pythagorean-theorem
https://matematicascercanas.com/2016/06/06/demostraciones-teorema-de-pitagoras/
https://www.geogebra.org/search/perform/search/teorema%20de%20pit%C3%A1goras