To Recover a deleted page. You need to:

• navigate to the side bar with in the space that you want to recover the deleted page. 
• Open Space tools then select Content Tools.
• Under Content Tools select Trash.
• All the deleted pages from this space will be here. Click Restore on the desired page you want to restore.
• NOTE - The page will restore under space home page. So you will need to move this page back into its correct location with in the page tree.