Choose a couple of the sequences. Try to picture how to make the next, and the next, and the next... Can you describe your reasoning?
An animation that helps you understand the game of Nim.
A triangle ABC resting on a horizontal line is "rolled" along the
line. Describe the paths of each of the vertices and the
relationships between them and the original triangle.
Can you describe what happens in this film?
The triangle ABC is equilateral. The arc AB has centre C, the arc
BC has centre A and the arc CA has centre B. Explain how and why
this shape can roll along between two parallel tracks.