幾何作圖 :
以一正方形對角線為半徑畫弧至 0 度作為 寬, 以正方形高度為 高.
以上述長寬繪製之矩形長寬比即為 A series 之長寬比
(以公分為單位, 四捨五入)
example :
A3 : 297 mm * 420 mm297 * √(2) = 420.0214280248092 ~= 420
Ref link :
- http://www.papersizes.org/a-paper-sizes.htm
- http://www.cadforum.cz/cadforum_en/how-to-enter-a-square-root-sign-in-autocad-text-tip10668
- https://knowledge.autodesk.com/support/autocad/learn-explore/caas/CloudHelp/cloudhelp/2016/ENU/AutoCAD-Core/files/GUID-518E1A9D-398C-4A8A-AC32-2D85590CDBE1-htm.html
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