http://www.mathopenref.com/pythagoras.html Pythagoras http://www.mathopenref.com/pythagoras.html http://www.mathopenref.com/pythagoras.html http://www.mathopenref.com/pythagoras.html http://www.mathopenref.com/pythagoras.html Pythagoras http://www.mathopenref.com/pythagoras.html