Дициметр

https://www.youtube.com/watch?v=97TaqBxpRvA&list=PLzU3-s7VUSuQ6nRXLYjFaquYQzqWj_j0p&index=60

Части фигур

https://www.youtube.com/watch?v=b88RUybANxY&list=PLzU3-s7VUSuQ6nRXLYjFaquYQzqWj_j0p&index=3