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First keep in mind that 20 square kilometers is not the same as 20 kilometers squared. Conversion units will have to be squared as well.

Second, remember that there are exactly 2.54 centimeters in an inch, or 30.48 cm/ft.

Third, to convert from kilometers to centimeters, just multiply by a hundred thousand, or 105.

Put it all together and you get 20 x (105 / 30.48)2 = 215,278,208.334... square feet (or about 7.722 square miles).

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14y ago

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