want to edit ned page…

hi
i see in my them the page
page.php
i see there the code php

<?php get_header(); ?>

<div id="content">
<?php if (have_posts()) : ?>

	<?php while (have_posts()) : the_post(); ?>
			SDDDDD
		<div class="post" id="post-<?php the_ID(); ?>">
			<h1><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h1>
			<p class="meta">Posted  by <?php the_author() ?> - <?php the_time('F jS, Y') ?></p>

			<div class="entry">
				<?php the_content('Read More »'); ?>
			</div>

			<p class="postmetadata">Posted in <?php the_category(', ') ?> - <?php edit_post_link('Edit','',' - '); ?><?php comments_popup_link('No Comments »', '1 Comment »', '% Comments »'); ?></p>
<p><?php the_tags(); ?></p>
		</div>

	<?php endwhile; ?>

		<p align="center"><?php next_posts_link('« Previous Entries') ?>   <?php previous_posts_link('Next Entries »') ?></p>

	<?php else : ?>
		<h2 align="center">Not Found</h2>
		<p align="center">Sorry, but you are looking for something that isn't here.</p>
<?php endif; ?>
</div>

<?php
get_sidebar();
get_footer();
?>

and i want to create page in php that use with this theme
so i copy the code and try to enter to this url
http://localhost/wordpress/wp-content/themes/Answers/page1.php
but this write
Fatal error: Call to undefined function get_header() in C:\wamp1\www\wordpress\wp-content\themes\Answers\page1.php on line 1

why?
what i need to do?

(i want to