How far have these students walked by the time the teacher's car
reaches them after their bus broke down?
If you have only 40 metres of fencing available, what is the maximum area of land you can fence off?
Experiment with the interactivity of "rolling" regular polygons, and explore how the different positions of the red dot affects the distance it travels at each stage.
Before starting to explore Charlie's mapping, you might want to watch a short video explaining how to use the NRICH Number Plumber.