A4 paper size in mm

What is A4 paper size in mm ?

A4 size in mm is 210x297

The aspect ratio of an A4 paper is 1:1.41,The area of an A4 paper is 62370 mm², Perimeter of an A4 paper is 1014 mm, Diagonal line of an A4 paper is 363.74 mm

Millimeter is a unit of length and a unit of rainfall, abbreviated in English as mm. 1mm=0.1cm=0.01dm=0.001m=0.000001km=1 000μm=1 000 000nm