npm package: @stdlib/constants-float64-half-pi
Description: 1/2 times π.
Author: The Stdlib Authors
Latest version: 0.2.3

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# HALF_PI

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> One half times the mathematical constant [π][pi].

<section class="installation">

## Installation

```bash
npm install @stdlib/constants-float64-half-pi
```

</section>

<section class="usage">

## Usage

```javascript
var HALF_PI = require( '@stdlib/constants-float64-half-pi' );
```

#### HALF_PI

One half times the mathematical constant [π][pi].

```javascript
var bool = ( HALF_PI === 1.5707963267948966 );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- TODO: better example -->

<!-- eslint no-undef: "error" -->

```javascript
var HALF_PI = require( '@stdlib/constants-float64-half-pi' );

console.log( HALF_PI );
// => 1.5707963267948966
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

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<section class="intro">

</section>

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<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/constants/float64/half_pi.h"
```

#### STDLIB_CONSTANT_FLOAT64_HALF_PI

Macro for one half times the mathematical constant [π][pi].

</section>

<!-- /.usage -->

<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

</section>

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<!-- C API usage examples. -->

<section class="examples">

</section>

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</section>

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<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/constants-float64/pi`][@stdlib/constants/float64/pi]</span><span class="delimiter">: </span><span class="description">π.</span>

</section>

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<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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[umd]: https://github.com/umdjs/umd
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[deno-url]: https://github.com/stdlib-js/constants-float64-half-pi/tree/deno
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/constants-float64-half-pi/main/LICENSE

[pi]: https://en.wikipedia.org/wiki/Pi

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[@stdlib/constants/float64/pi]: https://www.npmjs.com/package/@stdlib/constants-float64-pi

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