Home >>JavaScript Math Reference >JavaScript acos() Method

JavaScript acos() Method

JavaScript acos() Method

JavaScript acos() method is used to return the arccosine value of a given input number. It returns the value between 0 and PI radians. If the parameter x is outside the range -1 to 1 then the method will return NaN and if it is equal to -1 then it will return the value of PI.

Syntax:

Math.acos(x)

Parameter Values

Parameter Description
x This is a required parameter. It defines the given input number.

Browser Support

Method Chrome Edge Firefox Safari Opera
acos() Yes Yes Yes Yes Yes

Here is an example of JavaScript acos() method:

<html>
<body>
<p>Click the button to see the Output.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  document.getElementById("demo").innerHTML = Math.acos(0.77);
}
</script>
</body>
</html>
Output:

Click the button to see the Output.

 

Example 2:

<html>
<body>
<p>Click the button to see the Output.</p>
<button onclick="myFunction1()">Try it</button>
<p id="demo1"></p>
<script>
function myFunction1() {
  document.getElementById("demo1").innerHTML = Math.acos(-1);
}
</script>
</body>
</html>
Output:

Click the button to see the Output.

 


Popular Tutorials