You have shown that the circumference of a circle is π × diameter. ... TIP: Try it with any circular object. Whatever the size, the circumference is always just over 3 × diameter.

In the episode What Is Pi? we learned how to draw a circle arts-and-crafts style. To do this, start by cutting a 3-inch piece of string to serve as the radius of the circle.

In order to figure out the circumference of the circle, Rose says we need to first find its diameter, because circumference (c) is equal to pi (π) times diameter (d). In other words: c = πd.

I am Pi, the ratio of the circumference of a circle to its diameter. Picking up the phone here at the Smithsonian, I set out to find out more about Pi and how it is represented in the national ...

How to Solve for Radius in Excel. The radius of a circle or a sphere is the distance between the center and the edge. The radius can be used to calculate a circle's diameter, area and circumference.