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.

The misconception that it's a variable comes in part from the fact that we often express circumference and area in terms of Pi.

The math of pi explained, as simply as possible Pi day is March 14. Here’s the famous irrational number, explained in one GIF.

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 ...

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 ...

Approximating Pi By Rick Groleau Posted 09.01.03 NOVA Around 250 B.C., the Greek mathematician Archimedes calculated the ratio of a circle's circumference to its diameter. A precise determination ...

What is Pi Day, and why do we celebrate it every March 14? Here's what to know as math lovers around the world mark Pi Day.

Science Finding Pi Outside of the Circumference The number, which we celebrate on Tuesday, shows up more places than you might think.

As we celebrate again in 2018, here are some Pi Day facts you should know. What Is Pi? Pi represents the ratio of a circle’s circumference to its 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 ...

Pi Day is beloved by the scientific community worldwide as a way to celebrate the mathematical constant and engage in fun pie-related activities. Here's what to know about March 14.

That difference may not seem like much, but after consulting pi and doing some radius-related geometry, I realized the modern plates have almost 1.5 times the surface area of the '60s-era plates.