At 8.3 x 11.7" (210x297mm), A4 paper is slightly narrower and a little longer than "A" size 8.5 x 11" paper (216x279mm). The A4 is part of the ISO "A Series," where A0, the first dimension ...

Paper is available in many sizes, with A0 being the largest and the most common size being A4. Each is half the area of the one before, ie A4 paper (297 mm × 210 mm) is half the size of A3 paper ...

Several years back, I tried out what was known then as the “A4 paper challenge”, a social media trend that involves girls placing a piece of A4-sized paper in front of their waist. If the paper hides ...