Paper sizes
The most common system of Paper sizes in Europe is the ISO standard. Most people are familiar with the A series which includes A4. The C series is for envelopes - A C4 envelope being ideal for holding an A4 sheet. DL is a special size for envelopes designed to accept A4 paper folded in three.
The following table shows the width and height of all ISO A and B paper formats, as well as the ISO C envelope formats. The dimensions are in millimeters:
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