Source: http://www.youtube.com/watch?v=2qUPOzrP_xA
This is an example of using the converse determining what kind of triangle it is.
Source: http://www.youtube.com/watch?v=nEjkyxy4jMM
This powerpoint was found online however it is a great one to show how the Pythagorean theorem works and how the converse can be used to define triangles.
Source: teachers.henrico.k12.va.us/math/.../11.../PythagoreanThm.ppt
This gives a bit of history and how to find Pythagorean Triples mathematically.