Uitleg metriek stelsel https://www.youtube.com/watch?v=zYiXAxRfc1Q&t=43s
Ruimtefiguren https://www.youtube.com/watch?v=pi1Rqml_g3M
Inhoud kubus https://www.youtube.com/watch?v=jEfS8-TeH9I
Inhoud balk https://www.youtube.com/watch?v=zEpzt1iFzuE
Inhoud cilinder https://www.youtube.com/watch?v=uWnlD9C5scc
Inhoud piramide en kegel https://www.youtube.com/watch?v=V5QjOwyna-Q