View the video below and observe what happens. Can you tell where did the extra chocolate come from?

Now, explore the GeoGebra applet below by moving point A (up and down) and moving points B and C along the diagonal.

- What do you observe about the video and the applet?
- Are the video and applet similar?
- Where did the extra chocolate come from?

*Thumbnail*

* Created with GeoGebra by Guillermo Bautista*