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Calculating Area with PHP

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Full Code
Sometimes it is easier for you to see the full code instead of the split up code on the previous pages. Below is the full code for this program. 
 <head> 
 <title>Calculate Area</title> 
 </head> 
 <body> 
 <?php 
 if ($_GET['calc'] == "yes") 
 { 
 $width = $_GET['width']; 
 $length = $_GET['length']; 
 $area = $width*$length; 
 print "<h2>Results</h2>"; 
 print "The area of a rectangle $width x $length is $area <p>"; 
 } 
 ?> 
 <h2>Calculate Area</h2> 
 <form action = "<?php echo $_SERVER['PHP_SELF']; ?>" 
 method = "GET"> 
 Width: <input type = "text" name = "width" size=4> 
 <br/> 
 Length: <input type = "text" name = "length" size=4> <br> 
 <input type="hidden" name="calc" value ="yes"> 
 <input type = "submit" name = "Calculate"/> 
 </form> 
 </body> 
 </html>

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