Analyze how the circumference of a circle would change if the diameter was doubled

Well, the formula for the circumference of a circle is C=2 pie r, or C=pie d. Which is double radius times pie, or just the radius times pie, same thing. So, for example, if the diameter of the circle was three, then the circumference would be 3pie. If you double the diameter, making it six, then the circumference would be 6pie. In this example, it shows that if you double the diameter of a circle, it also doubles the circumference.