Business Rules v Business Requirements

rules
Part of my mission to explain why I am doing what I am doing at work… I have had to explain the difference between Business Rules and Business Requirements.
If you find yourself in the same situation these websites may be of some assistance with practical examples.
They also have the advantage that they show that it is not just ‘you’ being picky about the difference. THERE ARE solid differences between the two concepts.
I think this one is the best:
Now, should I document this using Use Cases or some other way?