You might have luck on the wayback machine. But some of the links are really, really old: [Inscribing a regular pentagon in a circle – and proving it](https://w

You might have luck on the wayback machine. But some of the links are really, really old: [Inscribing a regular pentagon in a circle – and proving it](https://web.archive.org/web/20001205213400/http://www.cut-the-knot.com/pythagoras/pentagon.html https://web.archive.org/web/20001205213400/http://www.cut-th...) fell off the web after 2000!