A3 drawing size: 297mm×420mm.
A2 Drawing size: 420mm× 594mm
Drawing size of A 1: 594 mm χ 841mm.
A0 drawing size: 841mmχ1189mm.
A4 paper size comes from:
Reason 1: A rectangle with a length of 2 and a width of X is X and 1 after being folded in half, so in order to ensure similarity, 1:X=X:2 is needed. The ratio obtained is the root number 2. When 297 is divided by 2 10, we get 1.4 14, which is close to the root number 2, and this ratio is exactly the same as the original paper type after a piece of paper is folded in half.
If it is not such a ratio, such as 4: 3, then we will find that the shape of the paper is distorted and becomes 3: 2 after being folded in half.
Reason 2: In fact, to meet this ratio, there can be other values, such as 282mm×200mm, or other sizes. However, the value of 2 10mm×297mm is related to 4 in A4. Since the size of A0 paper is 841mm×1189 mm, A4 paper is the size of A0 paper folded four times.
The extended data A3 refers to the specifications of the paper. According to the international standard A3, the paper size is 297mm×420mm, which is twice that of A4 paper. According to the national paper format industry standard (GB/T 1999), it is also called "Big 8 format".
Define the source
The standard basis of A3 paper comes from ISO 2 16.
Qi O 2 16 is an international standard for paper size defined by the International Organization for Standardization (ISO), which is currently used in most countries in the world. The well-known A4 paper size was developed for this standard. This standard was originally incorporated into DIN476 by DIN 1922. Although some formats were developed in France at the same time, they were later forgotten.
Before ISO2 16 was widely adopted, there were many different paper formats in the world. These formats are not a coherent system, and many of them are not defined in decimal units. ф O216defines the paper sizes of three series: a, b and c: C series paper size is mainly used for envelopes.
The format of ISO2 16 follows the ratio of 1: √ 2; Two pieces of paper put together have the same aspect ratio and the same edge. This function simplifies many things, such as: reducing and copying two A4 papers into one A4 paper; Enlarge and photocopy A4 paper into A3 paper; Photocopy and enlarge a half A4 paper into A4 paper, etc. , will run out of paper space, neither more nor less.
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