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A comment on Gimli Glider. Parent comment
A0 is 1 m^2, by area, with sides in a ratio of 1:sqrt(2).
When you fold it in half, you get the same ratio, but now A1:
A1 is 1/2 m^2.
A2 is 1/4 m^2.
A3 is 1/8 m^2.
A4 is 1/16 m^2.
etc.
So, if you buy paper, it will be, say, 80 g/m^2. Now, one page of A4 thus is 5 g.
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A0 is 1 m^2, by area, with sides in a ratio of 1:sqrt(2).
When you fold it in half, you get the same ratio, but now A1:
A1 is 1/2 m^2.
A2 is 1/4 m^2.
A3 is 1/8 m^2.
A4 is 1/16 m^2.
etc.
So, if you buy paper, it will be, say, 80 g/m^2. Now, one page of A4 thus is 5 g.