Section 5.5 Reference Topics

A variety of proofs of the Pythagorean theorem are found at this site. There are also some interesting remarks concerning this theorem:
http://sunsite.ubc.ca/LivingMathematics/V001N01/UBCExamples/Pythagoras/pythagoras.html

For those of you who think that irrational numbers can be written in some (yet unknown) decimal form, you might want to check out this totally useless web page:
http://antwrp.gsfc.nasa.gov/htmltest/rjn_dig.html

The irrational number is the subject of many web sites:

A fun trivial game:
http://eveander.com/trivia/

"Pi through the ages," is an interesting history of the number.
http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Pi_through_the_ages.html

Links