Summary: A large number of modern LCD TV's and projectors are setup to use a 16:9 aspect ratio. However, a number of users are used to creating presentations using the older stanard 4:3 aspect ratio. Ideally, it is best to use the aspect ratio that matches the LCD TV projector that the presentation will be displayed on. Following are instructions for doing so in both Microsoft PowerPoint and Apple Keynote.
|PowerPoint 2016 Instructions|