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Contact SupplierFor example, the dimensions of A4 paper are 210x297mm, and half of A4 equals A5, and double A4 equals A3.So why is A4 paper called A4? A4 is half an A3, or one quarter of A2, but more importantly, it's one sixteenth of A0. A0 has an area of one square metre (but it isn't a square), and every other paper size in the A series is based on A0


