Trying to put PHP in a page

CMS & WordPress
1

I uploaded a couple images to my themes images directory.
I went to the page tried to insert

<?php echo get_stylesheet_directory_uri(); ?>

but the source I get back is

<img id="urt-videos" src="../wp-content/themes/urturt/images/media-first-layer.jpg" alt="" /><br />
<img id="urt-ventures" src="<?php echo get_stylesheet_directory_uri(); ?>/images/media-second-layer.jpg&#8221; alt=&#8221;&#8221; />

the first image works, but not the 2nd