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20 squared is 400 which is a rational number

No because pi still remains as an irrational when squared.

81 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.

The square of any rational number is also rational.

It would simply be the irrational square root of a rational number. There is no special name for it.

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Rational

20 squared is 400 which is a rational number

Rational.

Rational.

Rational; 62 = 36. Any rational number that is squared is still rational.

No, it is rational.

No, it is rational.

It is a rational number as 9

They are rational.

Is the square root of 28 rational or irrational

Sometimes. eg the irrational number √2 squared is 2 which is rational (2 = 2/1) eg the irrational number √(√2) squared is √2 which is irrational.

-90 squared is rational - it is +8100. All perfect squares are not only rational but they are integers.