Drag the slider to change the radius of your circle. It will automatically tell you the area and circumference of it.
The background was changed to be a grid and the code was updated so that when the slider value was changed, the image would grow and shrink to match the scale of the grid. For example, if the radius is 2, the set size block would use the radius * 20. The code was also changed so that if the radius was 0, then the circle didn't appear.
