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What is the mathematical constant pi?

Who is credited with popularizing the use of the symbol for pi?

How many decimal places has pi been calculated to?

What is the value of pi approximated to by using the fraction 22/7?

Which US state attempted to legislate a value of pi in 1897?
Answers:

Pi is the ratio of a circle's circumference to its diameter, represented by the symbol π.

The Swiss mathematician Leonhard Euler is credited with popularizing the use of the symbol for pi.

Pi has been calculated to over 31 trillion decimal places, but most calculations are done to far fewer decimal places.

The value of pi approximated using the fraction 22/7 is 3.142857, which is close to but not exactly equal to the true value of pi.