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JavaScript acos() Method


Math Object Reference Complete Math Object Reference

Definition and Usage

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

Syntax

Math.acos(x)

Parameter Description
x Required. Must be a numeric value in the range -1 to 1


Tips and Notes

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

Note: -1 will return the value of PI.


Example

In this example we will get 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>

The output of the code above will be:

0.8762980611683406
1.5707963267948965
3.141592653589793
0
NaN 


Try-It-Yourself Demos

acos()
How to use acos() to get the arccosine of different numbers.


Math Object Reference Complete Math Object Reference

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