# Python 3 - Number atan2() Method

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## Description

The atan2() method returns atan(y / x), in radians.

## Syntax

Following is the syntax for atan2() method −

```atan2(y, x)
```

Note − This function is not accessible directly, so we need to import math module and then we need to call this function using math static object.

## Parameters

• y − This must be a numeric value.

• x − This must be a numeric value.

## Return Value

This method returns atan(y / x), in radians.

## Example

The following example shows the usage of atan2() method.

```#!/usr/bin/python3
import math

print ("atan2(-0.50,-0.50) : ",  math.atan2(-0.50,-0.50))
print ("atan2(0.50,0.50) : ",  math.atan2(0.50,0.50))
print ("atan2(5,5) : ",  math.atan2(5,5))
print ("atan2(-10,10) : ",  math.atan2(-10,10))
print ("atan2(10,20) : ",  math.atan2(10,20))
```

## Output

When we run the above program, it produces the following result −

```atan2(-0.50,-0.50) :  -2.35619449019
atan2(0.50,0.50) :  0.785398163397
atan2(5,5) :  0.785398163397
atan2(-10,10) :  -0.785398163397
atan2(10,20) :  0.463647609001
```
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