thanks guys - I was thinking of looking up form factors for actual paperbacks/ hardbacks - or measuring any we still have.
I think I am re-listing the galaxy tab s2 due to speaker placement being all wrong for movies - whatever I choose has to be good for books and for videos but I may look at other 4:3 makes
also, I found there's a thing called screen to body ratio, which varies by make, so a bit more math is needed to get from a headline tablet size to an actual visible screen area
estimate.
so instead of 8 inch, 9.7 inch... I am taking tablet's published width x height x screen-to-body % to estimate the actual visible screen area , then solving for estimated visible screen width & height in the correct ratio
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