irrational
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It is irrational because it can't be expressed as a fraction
The squqre root of 1,600 is 40. That's rational.
sqrt(40) or 2*sqrt(10) Evaluating the above will result in a decimal approximation which will be rational, not irrational.
No, 40 is a rational number.
It is an irrational number, and therefore a real number.