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42 is 16, less than 20

52 is 25, more than 20.

so, 20 is not a perfect square, and does not have an integral square root.

But, the square root of any integer is either an integer itself, or irrational.

So, square root 20 is irrational

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14y ago

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Q: Is the square root of 20 is rational or irrational?
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