Dann Corbit wrote:
But in a very real sense it is a measure of rotation. We could call it a special measure, sort of like the way that e is a special base compared to all others.
That's not the only thing that radians are useful for, though. Consider a weight bobbing up and down on a spring, or anything else with periodic behaviour. It's common to represent its position in the oscillation cycle in terms of an angle, even though nothing is actually rotating. -- Greg -- http://mail.python.org/mailman/listinfo/python-list