Stelling van Pythagoras

uitleg

https://www.youtube.com/watch?v=FS7ujwRXE-w
https://www.youtube.com/watch?v=L6sKVKTtPYw
https://www.youtube.com/watch?v=YzBoF-Vdh88
https://www.youtube.com/watch?v=uaj0XcLtN5c