A3 paper size in mm

What is A3 paper size in mm ?

A3 size in mm is 297x420

The aspect ratio of an A3 paper is 1:1.41,The area of an A3 paper is 124740 mm², Perimeter of an A3 paper is 1434 mm, Diagonal line of an A3 paper is 514.4 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