You're still assuming ALL of that remaining land area in the circle is habitable. Eg. India has 43% of it's land classified under "others" [0]. A large chunk o

You're still assuming ALL of that remaining land area in the circle is habitable. Eg. India has 43% of it's land classified under "others" [0]. A large chunk of that 43% is not likely to be habitable. 0: https://en.wikipedia.org/wiki/Land_use_statistics_by_country https://en.wikipedia.org/wiki/Land_use_statistics_by_country