This is a perfect circle in Scratch! This calculates the radius, diameter, circumference, and area! Calculates up to 14 digits of pi!
If you use this, please credit me August 3: Published August 4: Made a line in the middle for the diameter and added a diameter variable to know the diameter. Also added Circumference calculations Made it so if you move your cursor to the left side of the screen, it shows the varibles, else, it hides them