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In article <cline.725593960@ebony.cs.scarolina.edu> cline@cs.scarolina.edu (Ernest Cline) writes:

>However, what I would like to know is what size is A4 or C5 or the rest
>of these map references that ISO uses for paper.
>Please reply by e-mail or posting with either the sizes or suggestion on
>where to look for a listing of _all_ the sizes.


All A sizes can be determined as follows:

A0 is exactly one square meter in area and the ratio of its sides (or
the sizes of any A size paper) is sqrt(2), and each A(n+1) is exactly
half of A(n) in area (and thus cutting an A(n) in the middle results
in two A(n+1) papers, exactly).

Consequently, the longer side of A0 is the 4th root of 2 meters
or about 1189 mm, the shorter side that divided by sqrt(2) or 841 mm,
and A4 those divided by sqrt(2) to the 4th (=4) or 297*210 mm.

I.e., the sides of An paper are 2^(0.25-n/2) and 2^(0.25-(n+1)/2) meters.
I don't know if any rounding has been specified.
Actually I don't even know if the above rule has been written in the
ISO standard or whether they've just listed the sizes, but that's the
way the sizes were derived.  Anybody know better?

I don't know about the C sizes, but they appear to follow a similar
rule.  Roughly, Cn is 1.075 times An on each side.
--
Tapani Tarvainen  (tt@math.jyu.fi, tarvainen@finjyu.bitnet)