Because in Pythagoras' theorem for a right angle triangle when its sides are equal its hypotenuse can never be exactly worked out because it is a number times the square root of 2 which is an irrational number.
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It is used in electronics, note that the square root of 2 is 1.414.
It was the first number that was proven to be irrational.
8.5 to 2 significant figures (72.25 is its actual square).
2 square root 2
the square root of 4 is 2 square root 2