The size of A4 paper is 21.0 cm wide and 29.7 cm high, with an aspect ratio of √2:1.
Specifications of A4 paper: cm width and height
A4 paper is defined by the International Organization for Standardization (ISO) A paper size. Its aspect ratio is √2:1, that is, the ratio of width to height is 1.414:1.
Width and height in centimeters:
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