If the estimated population of the world is 6.8 billion, and the estimated livable land area of earth is 150 million sq km, than the average persons per square kilometer is around 45.3.
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Halv that given number,Make a square that has that half number as the length of a side.Stretch the string across the diagonal of the square from corner to corner.The length of the string is the square root of the given number
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the square root of the given number
Given a number, if you can find another number (usually smaller than the given number) when multiplied by itself yields the original given number then the original given number is a perfect square number
Divide the given number by 1,000. 1,000 meters = 1 kilometer 2,000 meters = 2.000 kilometers 3,000 meters = 3.000 kilometers 3,579 meters = 3.579 kilometers