Because, you know this question will come up! I’d like to have these graphics to explain when it does!

Mostly True Stories of K. Renae P.

Screenshot via I Like Pi

## What Is Pi (π)?

**π = c/d**

Pi (3.14) is the distance around a circle, or circumference, divided by its diameter. Pi is always the same number no matter the size of the circle.

## Why isn’t Pi rational?

Pi is an irrational number, which means that it is a real number with decimal that repeats forever. There is no exact value for the number since it repeats infinitely.

## Test it!

If you would like to investigate π on your own, try this brief experiment from Scientific American.

- Using a compass, draw a circle.
- Take one piece of string and place it on top of the circle, exactly once around.
- Straighten out the string; its length is called the circumference of the circle.
- Measure the circumference with a ruler.
- Measure the diameter of the circle, which is the length from any point on the circle straight…

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I can tell you what’s not pi: my blog. But pi is part of my username. 😉 And it’s a very good movie about a math guy becoming insane. Cool post. One of my favourit numbers.

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Wow, that was one creepy movie.

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