The
international paper was developed in 1922 by a German engineer, Dr. Walter
Porstmann.
- A3 is twice the size of A4.
- A2 is twice the size of A3, and four times
the size of A4.
- A1 is twice the size of A2, and eight times
the size of A4; and
- A0 is twice the size of A1, and sixteen times
the size of A4.
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