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The size of 12inches is the size of a ruler. Or you can think of it as the size of a very large foot.
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The first twelve inch calibrated ruler was invented in 1675, but the person who actually invented it has been lost in the passage of time.
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Mostly used paper is of A4 size, which measures 210 X 297 mm. In inches, A4 measures 8.3 X 11.7, A3 measures 11.7 X 16.5 inches and A1 measures 23.4 X 33.1 inches. For more information
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A4 paper is 8.3 × 11.7 inches in size, as compared to a regular sheet of paper that is 8.5 x 11 inches. A0 paper is 33.1 × 46.8 inches, and A10 paper is 1.0 × 1.5
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