To find the circumference close of a circle use the given approximation for π or the π button on a calculator and either the diameter close diameter The distance across the circle, circumference ...

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

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 ...