Only 5*pi is irrational.
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The square root of 5 is an irrational number
Just check the squares of a few whole numbers. If 55 is between two of those squares, then its square root is also between the corresponding square roots.
The numbers are 10 and 5
The square root of four twenty-fifths, is two fifths, because of the fact that the square root of four is two and the square root of twenty-five is five.
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