Quote:
Originally Posted by freeztar
Can you please be more specific?
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Ok.
The circle in the middle has an area of pi and a radius of 1.
Beyond that, is the first ring. If it has an outer radius of 2 and an inner radius of 1 its area is (2^2 - 1^2)pi or 3 pi. Depending on the model, the population density increases or decreases linearly with radii.
Beyond that, is the second ring. If it has an outer radius of 3 and an inner radius of 2 its area is (3^2 - 2^2)pi or 5 pi.
Beyond that, is the third ring. If it has an outer radius of 4 and an inner radius of 3 its area is (4^2 - 3^2)pi or 7 pi.
So in general, these areas have an approximate population density, which is multiplied by the area's "area" to get the population in that area.
