Reference for Wiring version 1.0 Build 0100+ If you have a previous version, use the reference included with your software. *If see any errors or have any comments, let us know.*

Name | ## HALF_PI (1.57079...) |
---|---|

Description | HALF_PI is a mathematical constant with the value 1.57079632679489661923. It is half the ratio of the circumference of a circle to its diameter. It is useful in combination with the trigonometric functions sin() and cos(). |

Syntax | ```
HALF_PI
``` |

Usage | Application |

Related | PI TWO_PI |