This is an experiment I made using scratch. It simply creates a circle, using a theory I'm testing. The theory is: the mathematical defenition of a circle is "a shape that is made up of 360 (degrees in a full rotation) points, all exactly the same distance from the circle's center." What this program does is just that. The pen is down, and an invisible sprite just goes out, comes back, and turns. Try experimenting with the number of degrees it turns. Overall, this is quite an interesting program if you like math! Made using Scratch v1.2 beta.