Quote:
Originally Posted by cfuruti
Well, had you printed on A2, that would be exactly 200% the width and height of A4, therefore you'd get 1:36. However, an A3 sheet, having exactly 2x the area of A4, has only square root of 2 (about 1.4142) of its width and height*. Therefore your model's final length and width will be approximately 141.42% greater, and the scale will be about 1:51, because 72 / 1.4142 ~= 50.91.
*remember, width x height = area, therefore if area doubles, linear dimensions increase only by sqroot(2)
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One caution regarding this approach to figuring the effects of enlarging....it works for European paper, but fails for American paper size. Tabloid paper (11 x 17) is twice the area of letter size, but the the dimensions of the edges if the paper do not change as the square root of the area change. The height of tabloid paper is 155% that of letter, and the width of tabloid is 129% that of letter.