Calculators Effects >>> Area Calculator.


		<script 
		language="javascript"
		type="text/javascript">

		/* Visit http://www.yaldex.com/ 
		for full source code

		and get more free JavaScript, CSS and DHTML scripts! */

		<!-- Modified by:  Ronnie T. Moore (JavaScript Source) -->

		<!-- 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>

		<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=15>

		</form>

		</center>