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Which of the following is a rational number? square root of 79, square root of 80, square root of 81, square root of 82
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Which of the following is a rational number?

square root of 79, square root of 80, square root of 81, square root of 82

User Benface
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The square root of 81 is rational since it equals 9. Rational numbers can be expressed as a fraction of two integers. The fraction here would be 9/1, hence it is rational. The others are not perfect squares and can’t be expressed as a fraction of two integers.
User Veerababu Medisetti
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