B4 paper size in mm

What is B4 paper size in mm ?

B4 size in mm is 250x353

The aspect ratio of an B4 paper is 1:1.41,The area of an B4 paper is 88250 mm², Perimeter of an B4 paper is 1206 mm, Diagonal line of an B4 paper is 432.56 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