## Description

`float `**atan2**

(float y, float x)

This function calculates the arc tangent of the two variables *x* and *y*. It is similar to calculating the arc tangent of *y* / *x*, except that the signs of both arguments are used to determine the quadrant of the result.

The function returns the result in radians, which is between -PI and PI (inclusive).

See also **acos()** and **atan()**.