1742400 square ft
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Exactly 40 acres.
1 acre = 43,560 square feet 0.4 acre = 17,424 square feet
40 acres is 400 square chains.
If it is exactly 40 acres square it will take one mile of fencing or 5,280 feet. However most tracts of land are 40 acres more or less meaning they are approximately 40 acres. 40 acres is one quarter mile long on each side more or less.
There are 17,424 square feet in 40% of an acre.Algebraic Steps / Dimensional Analysis Formula0.4acres* 43560 ft²1 acres= 17,424ft²