This video describes the relationship between the lengths of the sides of a right triangle.
The following contains a lesson on the Pythagorean Theorem. It goes into depth about how the theorem works, why it works, and examples. It allows you to go at your own pace, go back, and write on the screen if you need to take notes.
The following link contains real-world scenario application of the Pythagorean Theorem. It has the problems worked out as well to serve as a guide.
The following link will redirect you to a question poll that you can answer from your computer or phone.