Hi Carol,
its one of these metric euro-sizes ;-)
- A4 is 21 x 29.7 cm
- 1 cm =0.3937 inch
- so it should be ~ 8.26 x 11.69 inch

This system is based on a piece of paper with a size of 1-square-meter and a relation 
from a to b with 1 : 1,414 (root2), proposed to be a very harmonic one.
By folding A0, you get A1, and then folding it to A2 and then folding it to A3 and 
then.... (just for the curious)

zap (never really good at maths)

> what is A4? 
> bests, carol 


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