Almost three, more like two and a half.
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21,120 feet = 4 miles
There are 63,360 feet in 12 miles.
1,000 feet = 0.1894 miles
5280 ft = 1 mile 4224 ft = 4224/5280 = 0.8 miles.
The answer depends on the units used for "twelve by twelve". It should be pretty obvious that the number of square feet in 12 micrometres by 12 micrometres will be different to those in 12 miles by 12 miles!