Draw a straight line, and then continue it for the same length but deflected by an angle. If you continue doing this you will eventually return to roughly where you started, having drawn out an approximation to a circle. But what happens if you increase the angle of deflection by a fixed amount at each step?
swans on tea
Just another SFN Blogs site
nor is it like this
http://www.youtube.com/watch?v=QVuU2YCwHjw
if I first saw this on this very blog I apologise for requoting back to you.