I'm not to familiar with the mathematical terms they had offered. But reading them, I understood when the animation gave me a visualization. I could follow it, without being confused. It was accurate enough for me a first time user, to understand the basic meaning of it. This would be very helpful to students and teachers, it could teach them a lot and benefit them.It never seemed hard for me to understand, this site just offered a easy way to learn. This site was made for first time users,everything is there and its so simple.
It was interesting to read, and follow along on the animation.