把Letter size paper 裁成 A4 proportion
最近發表了一個殲-20戰機的摺圖。內中要用A4 size的紙。有朋友用Letter size 的紙去摺，當然不成比例。下面有一個簡單方法。可以把 Letter size 的紙裁成A4的比例去用。大家可以試試。
[*]Start with a US Letter paper. Fold a diagonal crease extending from the top-left corner to the right edge of the paper. Unfold.
[*]Bisect the left side of the paper. Fold so the left-edge of the paper aligns with the crease made is step 1.
[*]Note where the bottom-left corner is now located. Make a pinch fold here and then cut off a strip of paper off the long edge of the paper (the strip will be approx 3/4″ wide).
[*]The resulting rectangle is A proportioned (7.78″ x 11″).It is a little smaller than an A4 (8.27″ × 11.69″) but it is the closest you can get when starting with a US Letter paper. If you cut this piece of paper in half crosswise, the two smaller pieces (5.5″ x 7.78″) will be similar to that of an A5 paper (5.83 × 8.27). The A-series papers are special “silver rectangles” and have the unique feature of being cut in half and still retain the 1 to √2 ratio.
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