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JavaScript acos() Method
JavaScript Math Object
Definition and Usage
The acos() method returns the arccosine of a number as a numeric value value between 0 and PI radians.
Note: If the parameter x is outside the range -1 to 1, the browser will return NaN.
Syntax
Math.acos(x)
| Parameter | Description |
|---|---|
| x | Required. A number |
Browser Support
The acos() method is supported in all major browsers.
Tips and Notes
Tip: -1 will return the value of PI.
Example
Example
Return the arccosine of different numbers:
<script type="text/javascript">
document.write(Math.acos(0.64) + "<br />");
document.write(Math.acos(0) + "<br />");
document.write(Math.acos(-1) + "<br />");
document.write(Math.acos(1) + "<br />");
document.write(Math.acos(2));
</script>
document.write(Math.acos(0.64) + "<br />");
document.write(Math.acos(0) + "<br />");
document.write(Math.acos(-1) + "<br />");
document.write(Math.acos(1) + "<br />");
document.write(Math.acos(2));
</script>
The output of the code above will be:
0.8762980611683406
1.5707963267948965
3.141592653589793
0
NaN
1.5707963267948965
3.141592653589793
0
NaN
Try it yourself »
JavaScript Math Object
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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 and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.
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 and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.