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Math PI

The PI property of the Math object is used to get the constant PI. This is approximately 3.14159. <html>     <body>     <script language="JavaScript">     <!--     function doMath(){         var result = Math.PI;         document.form1.answer.value = result;     }     -->     </script>     <form name=form1>     The Approximate value of PI is:     <input type="text" name="answer" size=20>     <input type="button" value="Calculate" onClick='doMath()'>     <br>     </form>     </body>     </html>