√81 is a rational number.
In mathematics, a rational number is a number that can be described as the result of a fraction of value or does not have face value.
An irrational number is a type of real number which cannot be represented as a simple fraction or the values that have face value are irrational numbers. Example: √2, √3, and π are all irrational.
Here, √81 is a rational number,
81 is a perfect square, implies,
√81 = 9
because 81 is a perfect square, it is a rational number.
Thus, √81 is a rational number
Learn more about rational numbers here:
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