What is the size of the A4 drawing?
The standard was originally introduced into the DIN in 1922 by the German Empire (number DIN 476), although some of its format was developed at the same time in France, but later it was forgotten. ISO 216 defines the three sets of paper sizes A, B, and C. Group C paper sizes are mainly used in envelopes.
The length and width of A group than the paper size is your 2:1, then down to the nearest mm value. A0 defined as the area of one square meters, aspect ratio of root 2:1 paper. The following A1, A2, A3...... So the paper size is defined as the number one less paper along the long edge of the folded, and then rounding to the nearest value mm. B group paper size is the geometric average of the A group paper with the same number and less number. Group C paper sizes are mainly used in envelopes.
A4 size is 21*29.7cm (210mm * 297mm).This is defined by the international organization for standardization ISO 216, and most of the world's paper sizes are used in this international standard.
