The acos() function of the Math object accepts a number and returns its arc cosine value in radians. To convert the resultant value into degrees, multiply it with 180 and divide the result by 3.14159 (pi value).
Syntax
Its Syntax is as follows
Math.acos(0.5)
Example
<html>
<head>
<title>JavaScript Example</title>
</head>
<body>
<script type="text/javascript">
var result = Math.acos(0.5);
document.write("arccosine value: "+result);
document.write("<br>");
document.write("arccosine value in degrees: "+result*180/Math.PI);
</script>
</body>
</html>Output
arccosine value: 1.0471975511965979 arccosine value in degrees: 60.00000000000001