If you mean 0.3 times pi then it is an irrational number
rational
No, it is not.
Sqrt(4) is +/- 2 so it is rational, not irrational. The question, therefore, makes no sense.
No, it is not.
No, they are not.
No, it is rational.
No, it is not.
No. 4/9 is not a perfect square but radical(4/9) = 2/3 is rational.
No. Radical(9) is +3 or -3, both of which are rational.
Sqrt(25) is -5 or +5, both of which are rational.
The square root of 64 is 8, which is a rational number.