For problems like these, it's best to work backwards, starting with what you have. 1 square mile is 27878400 square feet (basically 1 mile or 5280 feet squared). Multiply that by the 3 square miles you were given, and you have a final answer of 83635200 square feet in 3 square miles.
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3 miles = 15,840 feet 6 miles = 31,680 feet
1 yard = 3 feet 1 square yard = 9 square feet 3 square yards = 27 square feet
32 or 3 x 3 = 9 square ft.
15 feet x 3 feet = 45 square feet
There is no direct relation from feet to square feet.