# FLOAT32_HALF_PI > One half times the mathematical constant [π][pi].

## Usage ```javascript var FLOAT32_HALF_PI = require( '@stdlib/constants/float32/half-pi' ); ``` #### FLOAT32_HALF_PI One half times the mathematical constant [π][pi]. ```javascript var bool = ( FLOAT32_HALF_PI === 1.5707963705062866 ); // returns true ```

## Examples ```javascript var FLOAT32_HALF_PI = require( '@stdlib/constants/float32/half-pi' ); console.log( FLOAT32_HALF_PI ); // => 1.5707963705062866 ```

* * *

## C APIs

### Usage ```c #include "stdlib/constants/float32/half_pi.h" ``` #### STDLIB_CONSTANT_FLOAT32_HALF_PI Macro for one half times the mathematical constant [π][pi].

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