# _PI

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The _PI function returns **π** as a _FLOAT value with an optional multiplier parameter.

## Syntax

*circumference*= _PI[(*multiplier*)]

## Parameters

- Optional
*multiplier*(*2 * radius*in above syntax) allows multiplication of the π value.

## Description

- Function can be used in to supply π or multiples in a program.
- Accuracy is determined by the return variable type AS SINGLE, DOUBLE or _FLOAT.
- The π value can also be derived using 4 * ATN(1) for a SINGLE value.

## Examples

*Example:* Calculating the area of a circle using a SINGLE variable in this case.

radius = 5 circlearea = _PI(radius ^ 2) PRINT circlearea

78.53982

## See also

*Navigation:*