Sizing a project for Samsung Tablet

I am having trouble entering the correct story size setup for a Samsung Tab S 8.4" tablet.   The client wants the video trainng to be mazimized on the tablet screen.  I entered the resolution dimensions  (2560 x 1600)provided in the specs, but it came out square and distorted.  I believe this is over the maximum allowed, but how do I adjust to get the most use of the real estate without distortion?   Help!  Thanks

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