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The problem provides a visual context in which to consider how graphs can represent horizontal and vertical movement over time.
A possible start to using the interactivity in a classroom could involve asking students to sketch the graphs in advance, before seeing the polygon(s) roll. Their suggestions could be displayed for all to see and discuss.
The pause button could be used to focus discussion on the different stages of the "journeys" and to make conjectures about what will follow.
Possible follow up questions:
This problem is the third of three related problems.
How far have these students walked by the time the teacher's car reaches them after their bus broke down?
A circle rolls around the outside edge of a square so that its circumference always touches the edge of the square. Can you describe the locus of the centre of the circle?
N people visit their friends staying N kilometres along the coast. Some walk along the cliff path at N km an hour, the rest go by car. How long is the road?