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Pi is the Greek letter that stands for the relationship between the diameter of a circle, and the circumference of same. It's about 3.14159 and change.

In other words, the distance AROUND a circle is about three times the distance Across that same circle, to the (edge to edge through the center).

This ratio is CONSTANT, no matter how big the circle.

No one "Invented" Pi - it was "Discovered" because it had always been there.

pi is an irrational number meaning you can take decimals out to infinity and it never ends or repeats: 3.141592653589793238462643383279502884197169399375105820974....

but it is often shortened to 3.14 to find the circumference of a circle.

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