Have a look at https://www.matematicasvisuales.com/english/index.html https://www.matematicasvisuales.com/english/index.html . It shows many nice visualization

Have a look at https://www.matematicasvisuales.com/english/index.html https://www.matematicasvisuales.com/english/index.html . It shows many nice visualizations. Amongst others it shows my my favorite proof of the Pythagorean Theorem https://www.matematicasvisuales.com/english/html/geometry/triangulos/pythagorasbaravalle.html https://www.matematicasvisuales.com/english/html/geometry/tr...