Pi Machine

Ben Joffe Feb 4, 2004

This code will calculate the surface area and volume of cones, spheres or cylinders of any dimensions as well as circle circumference and surface areas.

Round to decimal points.

Circle
Radius:

Sphere
Radius:

Cylinder
Radius of base: height:

Cone
Radius of base: height:

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The JavaScript Source: Math Related: Pi Machine

Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Command-s). The script is yours!!!

<!-- TWO STEPS TO INSTALL PI MACHINE:

1.  Copy the coding into the HEAD of your HTML document

2.  Add the last code into the BODY of your HTML document  -->

<HEAD>

function roundnum(pinum){

var numtimes=0;

var currentpower=1;

var currentround;

while (numtimes<rounding.options.selectedIndex) {currentpower=currentpower*10;numtimes=numtimes+1;}

currentround=Math.round(pinum*currentpower)/currentpower;

return currentround;

}

function show(what){

showfield.innerHTML=what;

}

function workcircle(){

if (circleradius.value=="") circleradius.value="0";

var pinum=roundnum(Math.PI*circleradius.value*circleradius.value);

show("The area of a circle with a radius of "+circleradius.value+":<br><input type=text size=20 value="+pinum+"> units squared.");

}

function workcircle2(){

if (circleradius.value=="") circleradius.value="0";

var pinum=roundnum(2*Math.PI*circleradius.value);

show("The circumference of a circle with a radius of "+circleradius.value+":<br><input type=text size=20 value="+pinum+"> units.");

}

function worksphere(){

if (sphereradius.value=="") sphereradius.value="0";

var pinum=roundnum(4*Math.PI*sphereradius.value*sphereradius.value*sphereradius.value/3)

show("The volume of a sphere with a radius of "+sphereradius.value+":<br><input type=text size=20 value="+pinum+"> units cubed.");

}

function worksphere2(){

if (sphereradius.value=="") sphereradius.value="0";

var pinum=roundnum(4*Math.PI*sphereradius.value*sphereradius.value);

show("The surface area of a sphere with a radius of "+sphereradius.value+":<br><input type=text size=20 value="+pinum+"> units squared.");

}

function workcylinder(){

if (cylinderradius.value=="") cylinderradius.value="0";

if (cylinderheight.value=="") cylinderheight.value="0";

var pinum=roundnum(Math.PI*cylinderradius.value*cylinderradius.value*cylinderheight.value);

show("The volume of a cylinder with a base radius of "+cylinderradius.value+" and a height of "+cylinderheight.value+":<br><input type=text size=20 value="+pinum+"> units cubed.");

}

function workcylinder2(){

if (cylinderradius.value=="") cylinderradius.value="0";

if (cylinderheight.value=="") cylinderheight.value="0";

var pinum=roundnum((2*Math.PI*cylinderradius.value*cylinderradius.value)+(2*Math.PI*cylinderradius.value*cylinderheight.value));

show("The surface area of a cylinder with a base radius of "+cylinderradius.value+" and a height of "+cylinderheight.value+":<br><input type=text size=20 value="+pinum+"> units squared.");

}

function workcone(){

if (coneradius.value=="") coneradius.value="0";

if (coneheight.value=="") coneheight.value="0";

var pinum=roundnum(Math.PI*coneradius.value*coneradius.value*coneheight.value/3);

show("The volume of a cone with a base radius of "+coneradius.value+" and a height of "+coneheight.value+":<br><input type=text size=20 value="+pinum+"> units cubed.");

}

function workcone2(){

if (coneradius.value=="") coneradius.value="0";

if (coneheight.value=="") coneheight.value="0";

var pinum=roundnum(Math.PI*coneradius.value*Math.sqrt((coneheight.value*coneheight.value)+((coneradius.value/2)*(coneradius.value/2))));

show("The surface area of a cone with a base radius of "+coneradius.value+" and a height of "+coneheight.value+":<br><input type=text size=20 value="+pinum+"> units squared.");

}

</script>

</HEAD>

<BODY>

<hr>

<p>Round to <select size="1" id="rounding">

</select> decimal points. </p>

<p><b>Circle<br>

</b>Radius: <input type="text" size=14 name=circleradius maxlength=10 onKeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;">

<p><b>Sphere</b><br>

Radius: <input type="text" size=14 name=sphereradius onKeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;">

<p><b>Cylinder</b><br>

Radius of base: <input type="text" size=14 name=cylinderradius onKeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;">

height: <input type="text" size=14 name=cylinderheight onKeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;">

Radius of base: <input type="text" size=14 name=coneradius onKeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;">

height: <input type="text" size=14 name=coneheight onKeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;">

</td></tr></table>

<hr>

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