C3 paper size in mm

What is C3 paper size in mm ?

C3 size in mm is 324x458

The aspect ratio of an C3 paper is 1:1.41,The area of an C3 paper is 148392 mm², Perimeter of an C3 paper is 1564 mm, Diagonal line of an C3 paper is 561.02 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