You take the number of ft in a mile and square it. so it is 5280 times 5280. There are 27720000 sq feet.
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52419 sq mi x 5280 ft/mile x 5280 sq ft/mi =1.5E12 sq ft
5280 ft = 1 mile 1320 ft = 1/4 mile 4 sides at 1320 = 1/4 sq mile 1320+1320+1320+1320 = 5280 the correct answer is 1 mile
5500 sq ft = 511 sq metres, approx. 5500 sq ft = 511 sq metres, approx. 5500 sq ft = 511 sq metres, approx. 5500 sq ft = 511 sq metres, approx.
1 sq. ft.= .09290304 sq. meters, so 320 sq. ft.= 29.728973 sq. meters.
360 sq m = 360 x 10.7639 sq ft = 3875 sq ft