400 sq. miles = 27,878,400 sq. ft. x 100 = 2,787,840,000 sq. ft.
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If you're talking about length and not area, 52.8 football fields (end-zones excluded) will have a length of 3 miles.
I guess you mean American football fields (base on use of "Fields" as opposed to "Pitches"). Assuming you mean the playing area including end zones, then: The field is 360ft long x 160ft wide meaning the area of 2 of them is area = 2 x 360ft x 160ft = 115,200ft2 1 mile = 5280ft, so 1 sq mile = 5280ft x 5280ft = 278,784,000ft2 So for 2 football fields area = 115,200ft2 = 115200 ÷ 278784000 sq miles ~=0.0041 square miles.
12 square km is equal to 4.63323 square miles.
8.2 sq km = 3.166 sq miles.
173,732 square miles.