The size of A3 paper is 420mm x 297mm
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A piece of paper has three dimensions. They are the length, width and thickness of the paper. Paper is available in many sizes such as A1, A3, A4 and A5.
A3.
a paper smaller than the average sized printer paper (A4)
Two - A sheet of A4 paper is exactly half the size of a sheet of A3.
A3 is 297 × 420 mm.mm or 11.69 × 16.54 inch.inch A1 is 594 × 841 mm.mm or 23.39 × 33.11 inch.inch