The A stands for A Series of the ISO paper sizes.
A4 paper size is 8.3in × 11.7in.
Half of A4 is A5.
Two full A4 size papers
The measurements of a size A4 paper are 11.7 x 8.3 inches or 297 x 210 millimeters. It is just a little bigger than the standard letter size of paper.
A3.
The A refers to the international standard paper size ISO216 series A4 size of 210mm x 297mm.
A4 paper size is 8.3in × 11.7in.
European size paper
A4 paper measures 8.27 x 11.69 inches.
Half of A4 is A5.
Two full A4 size papers
Yes
1mm
The size of the paper should be an A4 paper.
The measurements of a size A4 paper are 11.7 x 8.3 inches or 297 x 210 millimeters. It is just a little bigger than the standard letter size of paper.
A4 is an indicator of size, typically for paper, not of weight. Weight will vary by the material or paper's thickness.
No, Australia is one of the few countries in the world that use A3 as their standard format size. Even if it does, A3 and A4 are all part of the A series paper sizes defined by ISO 216.