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The square root of two is an irrational number. Rounded to ten decimal places, it is equal to 1.4142135623.
Ten square kilometers is a total area, while ten kilometers square is giving you the side of the square area. So ten kilometers square is actually ten times ten (100) square kilometers.
One hundred is ten squared = 102
9 is an odd square number less than 10 and 92 = 81 which is greater than 50