The actual size of A4 paper is 2 10mm×297mm or 8.27 inches×1.69 inches, and A5 paper is 5.83×8.27 inches, 148×2 10mm. A5 paper is half of A4 paper in terms of area. When A4 paper is divided into two halves, A5 paper will be obtained.
Ordinary paper size
A0 paper: the size is 841mm *1189mm.
A 1 paper: the size is 594 mm * 841mm.
A2 paper: The size is 420mm*594mm, which is a 4 paper.
A3 paper: paper with a size of 297mm*420mm, that is, No.8 paper.
A4 paper: Paper with the size of 2 10mm*297mm, namely 16 sheets, is the most used paper at present.
A5 paper: 32 pieces of paper with the size of 148mm82 10mm.
A6 paper: 64 pieces of paper with the size of 105mm* 148mm.
A7 paper: the size is 74mm* 105mm.
A8 paper: the size is 52mm*74mm.