Any number can be squared, but 12 is not a perfect square(I.E 3X3=9,4X4=16)
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The answer depends on the units used for "twelve by twelve". It should be pretty obvious that the number of square feet in 12 micrometres by 12 micrometres will be different to those in 12 miles by 12 miles!
4
The number is 3 or 4.
3 or 4.
Twelve thirds is equal to 4. The square root of 4 is 2, and since twelve thirds is equal to 4, the square root of twelve thirds is also equal to 4, which is 2.