In this site I found that playing with the shapes and moving them in a different position created different points to plot. There was so many of them and go through not just a few. This is a good site that will be helpful for people who are visual and hands on.
I didn't have any difficulty surveying this site, in fact I had a spectacular time thumbing through the different shapes and rearranging them.
Time spent reviewing site:
I click on most of them for about 5mins each for a total of about 25mins give or take. As a student that has a problem with math this would for sure be a site that I would talk about to my peers.