THE WORLD'S LARGEST WEB DEVELOPER SITE

☰ HTML CSS JAVASCRIPT SQL PHP BOOTSTRAP JQUERY ANGULAR XML

TUTORIALS REFERENCES EXAMPLES

×

JavaScript Reference

JavaScript

JS String JS Number JS Operators JS Statements JS Math JS Date JS Array JS Boolean JS RegExp JS Global JS Conversion

Browser BOM

Window Navigator Screen History Location

HTML DOM

DOM Document DOM Elements DOM Attributes DOM Events DOM Style

HTML Objects

<a> <abbr> <address> <area> <article> <aside> <audio> <b> <base> <bdo> <blockquote> <body> <br> <button> <canvas> <caption> <cite> <code> <col> <colgroup> <datalist> <dd> <del> <details> <dfn> <dialog> <div> <dl> <dt> <em> <embed> <fieldset> <figcaption> <figure> <footer> <form> <head> <header> <h1> - <h6> <hr> <html> <i> <iframe> <img> <ins> <input> button <input> checkbox <input> color <input> date <input> datetime <input> datetime-local <input> email <input> file <input> hidden <input> image <input> month <input> number <input> password <input> radio <input> range <input> reset <input> search <input> submit <input> text <input> time <input> url <input> week <kbd> <keygen> <label> <legend> <li> <link> <map> <mark> <menu> <menuitem> <meta> <meter> <nav> <object> <ol> <optgroup> <option> <output> <p> <param> <pre> <progress> <q> <s> <samp> <script> <section> <select> <small> <source> <span> <strong> <style> <sub> <summary> <sup> <table> <td> <th> <tr> <textarea> <time> <title> <track> <u> <ul> <var> <video>

Other Objects

CSSStyleDeclaration

JavaScript acos() Method

Math Object Reference JavaScript Math Object

Example

Return the arccosine of a number:

Math.acos(0.5);

The result will be:

Try it yourself »

Definition and Usage

The acos() method returns the arccosine of a number as a value value between 0 and PI radians.

Note: If the parameter x is outside the range -1 to 1, the method will return NaN.

Tip: -1 will return the value of PI.

Browser Support

Method
acos()	Yes	Yes	Yes	Yes	Yes

Syntax

Math.acos(x)

Parameter Values

Parameter	Description
x	Required. A number

Technical Details

Return Value:	A Number, from 0 to PI, or NaN if the value is outside the range of -1 to 1
JavaScript Version:	1.0

Math Object Reference

JavaScript Math Object

COLOR PICKER

colorpicker

LEARN MORE:

Color Converter
Google Maps
Animated Buttons
Modal Boxes
Modal Images
Tooltips
Loaders
JS Animations
Progress Bars
Dropdowns
Slideshow
Side Navigation
HTML Includes
Color Palettes

PRINT PAGE

ABOUT

W3Schools is optimized for learning, testing, and training. Examples might be simplified to improve reading and basic understanding. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using this site, you agree to have read and accepted our terms of use, cookie and privacy policy. Copyright 1999-2016 by Refsnes Data. All Rights Reserved.
Powered by W3.CSS.