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1189mm x 841mm
Yes its twice the size... 1189mm x 841mm
There can be no conversion.1189 mm x 841 mm is a measure of area in 2 dimensional space whereas an inch is a measure of distance in 1 dimensional space. The two measure different things and, according to the most basic rules of dimensional analysis, conversion from one to the other is not valid.
A1 The 'A' series of paper is such that A0 is 1m2 in area and each next number up is half the previous area: A1 is 0.5m2, A2 is 0.25m2 and so on. The ratio of the sides of the paper series are such that 1 Sheet of A0 can be cut in half parallel to its shorter side to create 2 sheets of A1; each sheet of A1 can be cut in half parallel to its shorter side to create 2 sheets of A2; and so on. The sides are in the ratio of 1 : sqrt(2). A0 is approx 841mm x 1189mm, A1 is approx 595mm x 841mm, A2 is approx 420mm x 595mm, A3 is approx 297mm x 420mm, A4 is approx 210mm x 297mm, and so on.
This is Unit Conversion 1 square yard x 3 ft/yd x 3 ft/yd x 12 in/ft x 12 in/ft = 1296 square inches