Area Calculator

Written by admin on December 25, 2008 – 7:16 am -

A simple calculator to determine the area of a square, triangle, rectangle, circle or sphere.
Author: Michael Hundt (mchundt@nglic.com) 

<!-- TWO STEPS TO INSTALL AREA CALCULATOR:

  1.  Copy the coding into the HEAD of your HTML document
  2.  Add the last code into the BODY of your HTML document  -->

<!-- STEP ONE: Paste this code into the HEAD of your HTML document  -->

<HEAD>

<SCRIPT LANGUAGE="JavaScript">

<!-- Begin
function doArea(num) {
switch(num) {
case 0 : return (""); break;
case 1 : var length = prompt("Please enter the length of your square:", "");
         length = length * length;
         return (length); break;
case 2 : var width = prompt("Please enter the width of the base:", "");
         var height = prompt("Please enter the height of the triangle:", "");
         return (width * height / 2); break;
case 3 : var width = prompt("Please enter the width of your rectangle:", "");
         var height = prompt("Please enter the height of your rectangle:", "");
         return (width * height); break;
case 4 : var radius = prompt("Please enter the radius of the circle: ", "");
         return (Math.PI * Math.pow(radius, 2)); break;
case 5 : var radius = prompt("Please enter the radious of the sphere:", 0);
         return (4 * Math.PI * (Math.pow(radius, 2))); break;
   }
}
//  End -->
</script>
</HEAD>

<!-- STEP TWO: Copy this code into the BODY of your HTML document  -->

<BODY>

<center>
<form name=calcarea>
Find the area of a
<select name="shape" size="1" onChange="this.form.area.value = doArea(this.selectedIndex);">
<option> ...
<option value="square">Square
<option value="triangle">Triangle
<option value="rectangle">Rectangle
<option value="circle">Circle
<option value="sphere">Sphere
</select>
= <input type=text name=area size=10>
</form>
</center>

<!-- Script Size:  2.01 KB -->

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Posted in Calculator |

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