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There are 5280 ft. in a mile. So if your question is how many square miles are in a mile, there aren't any.
1.8 miles * 18 ft = 1.8*5280 ft * 18 ft = 171072 sq ft
400 sq. miles = 27,878,400 sq. ft. x 100 = 2,787,840,000 sq. ft.
127,354 sq miles = 3,550,425,753,600 sq ft
It depends on the units for 30x28. Is it 30 ft x 28 ft or 30 inches x 28 inches or 30 miles x 28 miles?