C1 paper size in mm

What is C1 paper size in mm ?

C1 size in mm is 648x917

The aspect ratio of an C1 paper is 1:1.42,The area of an C1 paper is 594216 mm², Perimeter of an C1 paper is 3130 mm, Diagonal line of an C1 paper is 1122.85 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