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↑
Calculators >>>
A simple calculator to determine the area of a square, triangle, rectangle, circle or sphere.
Add the below code to the <body> section of your page:
<script
language="javascript"
type="text/javascript">
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;
}
}
</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>
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