What is the approximate drawing area of the Metric A0 paper size?

The Metric A0 paper size measures approximately 841 millimeters in width and 1189 millimeters in height when expressed in the standard metric units, specifically for the A-series paper sizes defined by the ISO 216 standard. The size B, which states 1149 X 801, is close but does not accurately represent the dimensions of A0.

In contrast, the drawing areas of the other options correspond to the sizes of different A-series papers. Option C, with dimensions of 841 X 594, represents A1 size, while option D, 420 X 297, corresponds to A3 size. The dimensions of the A-series are halved as you move down the series from A0 to A1, A1 to A2, and so forth. Thus, drawing from this understanding, the correct representation purely for A0 dimensions confirms that the only correct figure should be 841 X 1189. B does not accurately reflect the A0 specification, highlighting the importance of knowing the definitions of paper sizes in the A series.