Radius of “viewable” region in google maps v3

Question

I need to know how to retrieve the radius of the viewable zoom level in google maps API v3.

For example, if I am at zoom level 3, and depending on the users screen s

Answer 1

I believe Bounds have the getNorthEast() and getSouthWest() methods, but this would give you a rectangle (which bounds really is) and you could than calculate the distance between those two, etc. To calculate the circle out of that rectandle might be a bit of work...

Maybe this will help: http://code.google.com/apis/maps/articles/mvcfun.html

and the example: http://code.google.com/apis/maps/articles/mvcfun/step6.html