2 square kilometers = 21,527,820.833 square feet.
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Square root (1 km^2) = 1 km.
2 km X 2 km = 4 km^(2)
Gypsum or plaster board3 3/8 inch 1.56 pounds per square foot 1/2 inch 2.08 pounds per square foot 5/8 inch 2.60 pounds per square foot
If the area of a square is one square foot, it means that each side of the square is one foot long. The perimeter of a square is the sum of all its four sides, so in this case, the perimeter would be 4 feet (1 foot + 1 foot + 1 foot + 1 foot).
A linear foot is distance. A square foot is area. One square foot is the area of some square tiles used on floors. Ten square feet is 1 foot x 10 feet or 2 feet x 5 feet. Don't confuse this with a 10 foot square which is 10 feet by 10 feet which equals 100 square feet.