Wonderful. Also, if you find the Pythagorean Theorem particularly interesting, I would suggest Simon Singh's book, Fermat's Enigma. It's about Fermat's Last Theorem, which went unproved for over 300 years. It's a variation of the Pythagorean Theorem, only it deals with exponents over two. For example, a^3+b^3=c^3. Fermat said there were no solutions. However, he did not write down his proof, so we couldn't be sure he was correct. Anyway, it's a very interesting book by one of my favorite mathematicians.