Resize echo text

I have a page that displays text the user typed in a form before that. If the user types a lot in the form and submits, the page that displays the text has a horizontal scroll bar. How could I make the text automatically do a line break after the text fills the screen? It needs to be 8.5 x 11 so it will print. What should I do to the textbox/display page? Here's some code I used:
text area:\[code\]<textarea name="body" id="textarea">\[/code\]display page:\[code\] <h3> <?php echo "$body"; ?> <br /> </h3>\[/code\]When the text is sent using post and get, it is encoded and decoeded. Thanks..
 
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