What is the square root of pi squared?

Answer 1

π (pi). If you square pi and take the square root of that, you get pi. If you take the square root of pi and square that, you again get pi.

The general answer to "What is the square root of x squared?", where x is any real number, is x itself -- but depending on where you put the implicit parentheses (whether you square first or take the square root first) the intermediate value may be an imaginary number.

Pi cannot be represented by an exact decimal (because it cannot be represented by a fraction, which is what "irrational" means in mathematics), but the beginning is 3.141592653589793238462643383279502884197. For more digits and more info, see Wikipedia's article on "Pi" is useful.

Edit:

All true except for one minor point: The mathematical answer to "What is the square root of x squared?" is not x itself. It is +x OR -x. So, the square root of pi squared is + pi or -pi
3.1415926535897932384626433