it is 1/10000000000 of the distance from the north pole to the equator (note it is the north pole becuz the south pole is slightly farther)
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Milli
square root
Variable, or if you're a purist - vary.
One definition of "root" is "the basic cause, source, or origin of something." The source of a perfect square is the number that was multiplied by itself to create it: the root of the square, the square root.
flys are a millimeter long