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

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