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# How Far Does it Move?

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Age 11 to 14

Challenge Level

*How Far Does it Move? printable sheet*

Take a look at the interactivity below which shows regular polygons "rolling" along the horizontal surface.

It leaves a trace of the path of the dot and on the graph it records the distance that the dot travels.

Experiment by positioning the dot at the centre of the polygons, at one of the vertices or at the centre of one of the sides of the polygons and explore how this affects the distance / time graph.

**Challenge:**

Can you now work out what produced the following distance / time graph?

Can you work out how many sides the polygon had and where the dot was placed?

Try to explain how you worked it out.

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?