Quote:
Originally Posted by theducks
Interesting comment 
Paperback books in the USA are 9:16 (longscreen, which is WS in Portrait)
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But most PDFs are formatted for an A4 page, which is much closer to 4:3 than 16:9 or 16:10. That's why I find my iPad with its 4:3 aspect ratio so useful as a PDF reader (I have to read a lot of academic PDFs for my studies).