Question

How to calculate PI value with atan() function in JavaScript

Answer 1

<script type="text/javascript">        

var pi;
         
pi = Math.atan(1) * 4;
     
document.write("pi = " + pi + "<br />");

/*
run:
  
pi = 3.141592653589793
    
*/

</script>

 

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Answer 2

<script type="text/javascript">        

var pi;
         
pi = 2 * Math.atan(Infinity);
     
document.write("pi = " + pi + "<br />");

/*
run:
  
pi = 3.141592653589793
    
*/

</script>

 

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