H 1.1 Vlakke figuren

Uitleg vlakke figuren https://www.youtube.com/watch?v=nbSgdPCY9Ks

Vierkanten https://www.youtube.com/watch?v=14ZWgwIhkZw&list=PLqmYEL-9zWjOHe42KExqEuhMJtZPAYco5

Rechthoeken https://www.youtube.com/watch?v=8hYZwe4oVDo&list=PLqmYEL-9zWjOHe42KExqEuhMJtZPAYco5&index=2

Diagonalen https://www.youtube.com/watch?v=4Y3ddgjsAZc&list=PLqmYEL-9zWjOHe42KExqEuhMJtZPAYco5&index=3