# Pi (3.141...) function

To use this function, choose Calc > Calculator.

Inserts the constant π, rounded to six decimal places (3.141592). Pi is the ratio of a circle's circumference to its diameter.

## Syntax

PI()

You can also use the predefined constant K1000.

## Example

To determine the circumference of a circle with the diameter 15:
Column Calculator expression Result
C1 contains 15 C1*P() 47.12388980384689

## Uses

For a circle with a specified radius (r), pi can be used to calculate its area (πr2) and circumference (2πr). Based on this relationship, pi can also be used to determine the volume and surface area of cones and cylinders, and to calculate related phenomena such as liquid flow rates and frequency of pendulum cycles.

In statistics, pi is used in the formula to calculate the probability density function for the normal distribution, and the variance of the logistic and extreme value distributions.

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