### ATAN2

Returns the arctangent of a ratio

**Syntax:**

**Usage:**

`
`

*result*= ATan2(

*y*,

*x*)

**Parameters:**

`y`

Vertical component of the ratio.

`x`

Horizontal component of the ratio.

**Return Value:**

The angle whose tangent is

`, in radians, in the range [-Pi..Pi].`*y**/x***Description:**

`ATan2`returns the arctangent of the ratio

`as a`

*y**/x*`Double`within the range of -Pi to Pi. The arctangent is the inverse of the

`Tan`function. The returned angle is measured in radians (not degrees).

**Examples:**

Print Atan2 ( 4, 5 ) 'this is the same as PRINT ATN ( 4 / 5 )

The output would be:

0.6747409422235527

**Differences from QB:**

- New to FreeBASIC

**Dialect Differences:**

- Not available in the
*-lang qb*dialect unless referenced with the alias.**__Atan2**

**See also:**

Back to Math