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<html>
<head>
<title>A Simple Page</title>
<script language="JavaScript">
function calcArea(){
inpRadius = 3;
alert(Math.PI * ((inpRadius)*(inpRadius)));
}
function calcPeri()
{
inpRadius = 3;
alert(2 * Math.PI * (inpRadius));
}
function calcVol()
{
inpRadius = 3;
alert(Math.PI * ((inpRadius)*(inpRadius)*(inpRadius)) * (4/3));
}
</script>
</head>
<body>
<input type="button" value="Calculate circle area" onclick="calcArea();">
<input type="button" value="Calculate circle Peri" onclick="calcPeri();">
<input type="button" value="Calculate sphere volume" onclick="calcVol();">
</body>
</html>
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