43,560 sq ft = 1 acre
None. Because "feet" are a measure of length and "acre" is a measure of area.However a "acre" contains 43560 "square feet".
There is no sensible answer to this question. An acre is a measure of area, with dimensions [L2]. A metre is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.
32,266 CY
One acre is 43,560 square feet or 4840 square yards. The conversion would be 2.89 acres.
As one square mile = 640 acre's 40 000 square mile = 25 600 000 acre's Found using http://www.onlineconversion.com/area.htm