> ## Documentation Index
> Fetch the complete documentation index at: https://axiom.co/docs/llms.txt
> Use this file to discover all available pages before exploring further.

<AgentInstructions>

## Submitting Feedback

If you encounter incorrect, outdated, or confusing documentation on this page, submit feedback:

POST https://axiom.co/docs/feedback

```json
{
  "path": "/apl/scalar-functions/mathematical-functions/radians",
  "feedback": "Description of the issue"
}
```

Only submit feedback when you have something specific and actionable to report.

</AgentInstructions>

# radians

> This page explains how to use the radians function in APL.

Use the `radians` function in APL to convert an angle from degrees to radians. The conversion formula is `radians = (π / 180) × angle_in_degrees`.

`radians` is useful as a preprocessing step before calling trigonometric functions such as `sin`, `cos`, or `tan`, which all expect their input in radians. If you have angle data in degrees, pass it through `radians` before applying any trigonometric operation.

## For users of other query languages

If you come from other query languages, this section explains how to adjust your existing queries to achieve the same results in APL.

<AccordionGroup>
  <Accordion title="Splunk SPL users">
    Splunk SPL doesn't include a built-in `radians()` function. You compute the conversion manually by multiplying the degree value by `pi() / 180`.

    <CodeGroup>
      ```sql Splunk example theme={null}
      | eval angle_rad = angle_deg * (pi() / 180)
      ```

      ```kusto APL equivalent theme={null}
      ['sample-http-logs']
      | extend angle_rad = radians(angle_deg)
      ```
    </CodeGroup>
  </Accordion>

  <Accordion title="ANSI SQL users">
    In SQL Server and PostgreSQL, `RADIANS()` is a built-in function with identical semantics to the APL version.

    <CodeGroup>
      ```sql SQL example theme={null}
      SELECT RADIANS(angle_deg) AS angle_rad FROM logs
      ```

      ```kusto APL equivalent theme={null}
      ['sample-http-logs']
      | extend angle_rad = radians(angle_deg)
      ```
    </CodeGroup>
  </Accordion>
</AccordionGroup>

## Usage

### Syntax

```kusto theme={null}
radians(a)
```

### Parameters

| Name | Type | Required | Description                      |
| ---- | ---- | -------- | -------------------------------- |
| `a`  | real | Yes      | The angle in degrees to convert. |

### Returns

The angle in radians corresponding to the input degree value.

## Example

Use `radians` to convert an angle in degrees to radians.

**Query**

```kusto theme={null}
print result = radians(180)
```

[Run in Playground](https://play.axiom.co/axiom-play-qf1k/query?initForm=%7B%22apl%22%3A%20%22print%20result%20%3D%20radians%28180%29%22%7D)

**Output**

| result |
| ------ |
| 3.1416 |

## List of related functions

* [degrees](/apl/scalar-functions/mathematical-functions/degrees): Converts radians to degrees. Use it for the inverse conversion after trigonometric computations.
* [pi](/apl/scalar-functions/mathematical-functions/pi): Returns the constant π. Use it when you want to compute radian conversions manually instead of using `radians`.
* [sin](/apl/scalar-functions/mathematical-functions/sin): Returns the sine of an angle in radians. Use `radians` to prepare degree inputs before calling `sin`.
* [cos](/apl/scalar-functions/mathematical-functions/cos): Returns the cosine of an angle in radians. Use `radians` to prepare degree inputs before calling `cos`.
* [tan](/apl/scalar-functions/mathematical-functions/tan): Returns the tangent of an angle in radians. Use `radians` to prepare degree inputs before calling `tan`.