### Why do this problem:

Probability often forces us to be particularly careful with our
justification of answers. This problem has a simple enough
numerical answer but the visualisation to support it must be
carefully considered.

### Possible approach :

This problem might make a good poster, displayed somewhere it
will catch students' attention to promote discussion.

The extent to which students need some practical activity will
depend on how accustomed they are with visualisation tasks.

### Key questions :

- What do you think the answer might be?
- Do you have a way of looking at this situation so that you are
sure your answer is right?

### Possible extension :

- Research the problem context called Buffon's Needle

### Possible support :

For students who cannot access this problem directly or
theoretically the following activities may be helpful :