Pythagoras

So we all know that to find the length of a hypotenuse you use the formula A squared + B squared = C squared.  What happens, however, if A and B = 1 ?  Did Pythagoras note this problem?  Is 2 the only number with an infinite decimal for a square root?  How do you find the length of the hypotenuse in this situation?  

>>1
You just say the answer is root 2 and tell the decimal fraction equivalent to get the hell out.

Most roots of naturals are irrational. Root 3, 5, 6, 7, etc.