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Q: Why 20 squared is an irrational number?

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20 squared is 400 which is a rational number

No because 7 squared equals 49 which is a rational number but the square root of 7 is an irrational number

Any number that can't be expressed as a fraction is an irrational number.

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.

5 squared is 5*5 is 25. 25 is not an irrational number.

22=4, so no, it's not an irrational number.

No because 102 squared is 10404 which is a rational number

Because it has no number that can be squared to make it.

No. Perfect squares as the squares of the integers, whereas irrational squares as the squares of irrational numbers, but some irrational numbers squared are whole numbers, eg √2 (an irrational number) squared is a whole number.

3 squared is 9 and 4 squared is 16, so the square root of any whole number between 9 and 16 will be irrational.

No because 25 is a rational number

Rational.

Rational.

Yes and the area of any circle is an irrational number because its area is pi*radius squared whereas pi is an irrational number.

15.652 an irrational number that I have rounded off.

x is an irrational number

It is a rational number as 9

12 squared is not irrational. It's 144 .

No because 36 squared is 1296 which can be expressed as an improper fraction in the form of 1296/1 whereas irrational numbers can't be expressed as fractions.

Yes it is. Good question!!

You think I know buddy ok buddy

The square of any rational number is also rational.

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

28 squared is 784 which is a rational number

If you mean is it a perfect square, then no; it is an irrational number (square root of 32 is 5.6568544249). But if you mean can it be squared, then yes; 32 squared is 1024