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A bit of quick math says a 7" 3x4 screen has 36% more screen area than a 6" 3x4 and an 8" 3x4 screen has 30% more screen area than a 7" 3x4 screen and 77% more screen area than a 6" 3x4 screen.
I'm making the assumption that an eInk ereader has a 3x4 aspect ratio which is very close to the aspect ratio of most of the ereaders I am aware of.
8" 3x4 screen has a surface area of 30.72 square inches. 4.8" x 6.4"
7" 3x4 screen has a surface area of 23.52 square inches. 4.2" x 5.6"
6" 3x4 screen has a surface area of 17.28 square inches. 3.6" x 4.8"
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