Learn about the definition of pi in relation to a circle with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

In particular, after a quick refresher of circle basics, we’re going to figure out why the equation for the circumference of a circle that we all learned in school works, and we’re also going ...

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 ...

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 ...

Exploratorium attendees show children how Pi is the ratio of a circle's circumference to its diameter during Pi Day in San Francisco, Thursday, March 14, 2013. (Exploratorium) ...

Everybody knows the value of pi is 3.14…er, something, but how many people know where the ratio came from? Actually, the ratio came from nature—it’s the ratio between the circumference of a ...

It is derived simply, by dividing the circumference of a circle by its diameter, or π = C/d, but the result is a never-ending "irrational" number: 3.14159265.

All circle calculations use the constant π (pi). The circumference close circumference The distance around a circle; its perimeter. divided by the diameter close diameter The distance across the ...