A4 is a regular size piece of paper (at least in Europe that is) and measures 21 cm by 29.7 cm.
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A4 paper size is 8.3in × 11.7in.
Half of A4 size paper is size A5.Same as A4 is half of A3.etc. etc.
A typical sheet of A4 paper is 0.05 mm thick. The weight of a typical sheet of A4 paper is 5 grams.
8 A4 peices of paper and a third
It can be up to much more bigger than an A4 size paper
An A4 page is printer paper.
The width and height of ISO A4 paper is 210 × 297 mm.
European size paper
At 300 dpi it would be 2,490 x 3,510 pixels.
29.7cm width and 42cm height. Double the size of A4.