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An A4 is 21cm wide. A 6" screen is around 12cm high, so if you turn the reader in portrait orientation, you're fittin 21cm in 12cm, which is a 12/21 = 57% scale. That turns a 12pt font into ~6.85pt
If the A4 PDF has 1in margins, the text is ~16cm and the scale is 75%, with which 12pt becomes 9pt
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