Squared Circle

I was trying to find the relationship between the circumference and area of a circle for a maps exercise utilizing Miller's C. This is the ratio of a shape to a circle who's circumference equals the perimeter of said shape. I never could find out how to calculate the area of a circle given it's circumference, and had to work it out on my own:

It took me 28 seconds to derrive this simple relationship (equation) based on Pi-R^2. But I spent about 20 minutes idly searching for it. The first search I found , however, led me to proof that Jesus did indeed create everything, which works out good enough. I think I need to read the links from that page, they look interesting...

--gh