A4 x 2 = A3
A3 x 2 = A2 (420 x 594 mm)
A2 x 2 = A1
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a3
Two full A4 size papers
The size of A3 paper is 420mm x 297mm
A3.
A0 is twice the size of A1 A1 is twice the size of A2 A2 is twice the size of A3 A3 is twice the size of A4 A4 is twice the size of A5 A5 is twice the size of A6 And so on