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The dimensions of an A9 envelope is 5 and 3/4 by 8 and 3/4. They can fit an 8 and 1/2 by 11 inch piece of paper quite well, if it is folded properly.
105mm × 148mm
The measurements of a size A4 paper are 11.7 x 8.3 inches or 297 x 210 millimeters. It is just a little bigger than the standard letter size of paper.
210 mm x 99 mm
Two of the most common paper measures are quire (25 sheets) and ream (500 sheets, or 20 quires).