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Amongst the many properties of pi is the fact that it is the ratio of the circumference

of any circle to its diameter.

It is a special kind of irrational number, called a transcendental number. It is roughly

equal to 3.14159 (a degree of accuracy that is adequate for most normal purposes)

but its value was calculated to 5 trillion digits in Oct 2011.

"Pi" (a letter in the Greek alphabet) is the symbol used for the number that is the ratio

of the circumference of a circle to the circle's diameter. It's a natural property of circles,

and every circle produces the same number: 3.14159... plus more decimal places that

never end.

Although 'pi' is defined in terms of a property of circles, it crops up in connection with

just about every aspect of math, Physics, electronics, etc.

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Q: What does the math term pi mean?
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