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

## Syntax

circumference = _PI[(multiplier)]

## Parameter(s)

- 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 � value can also be derived using 4 * ATN(1) for a SINGLE value.

## Example(s)

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

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

```
78.53982
```