But I found dignity in the Greek form of my name. 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 ...

and you can see that the ribbon is just over 3 times the diameter of 1 circle. This number, called π (or pi), is approximately 3.14. You have shown that the circumference of a circle is π × ...

In particular, after a quick refresher of circle basics, we’re going to figure out why the equation for the circumference ... It’s half the diameter. Okay, but what’s the diameter?

Time is a flat circle, Matthew McConaughey tells us, neglecting to explain how then we could measure time's circumference to derive its diameter, using pi. (Maybe it's best not to take the ...

Actually, the ratio came from nature—it’s the ratio between the circumference of a circle and its diameter, and it was always there, just waiting to be discovered. But who discovered it?

Archimedes' method finds an approximation of pi by determining the length of the perimeter of a polygon inscribed within a circle (which is less than the circumference of the circle) and the ...

During the first celebration, the Exploratorium's employees marched around one of the circular spaces of the museum because Pi is the ratio of a circle's circumference to its diameter. It took ...

If I cut out circles of different diameters and measure the mass of the circle then I can calculate the area. If the area is also supposed to be πR 2, I can make a plot of area vs. diameter squared.

Successful 5th graders learn that the circumference of a circle is equal to pi times the circle’s diameter: c = pi x d. That is a fairly useless lesson—a computer can do it more quickly and ...