# Atn

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*This function is for BASIC compatibility. It is not available in pure JavaScript projects.*

Atn(*number*)

## Description

Atn returns the arctangent of a number in radians. The required parameter, *number*, is any numeric expression.

To convert degrees to radians, multiply degrees by π/180. To convert radians to degrees, multiply radians by 180/π.

## Example (BASIC)

Rem Atn Example 'Atn calculates the arctangent of a number Dim Pi Pi = Atn(1) * 4 Print "The value of pi is " & Pi

## Output

The value of pi is 3.141592653589793