Confused Scale conversion

[80/20]

I have a plan that was plotted at 1:100 on A3 paper - this was then
reduced down to A4 paper.

What conversion factor to I use to calculate the sizes?

Cheers
Steve

[jg]

A3 is 420x297, A4 is 210x297. Too lazy to work out whether width or
height reduces by more, but because the printer will probably reduce by
more than paper size because of margins anyway, why not just measure
between 2 points on each dwg and calculate the proportion?

[80/20]

Thanks for quick reply, can't measure dwg on A3 as I have only been
sent A4 photo copy.
As the dwg is landscape, I'm assuming papersizes are A3 420 wide x 297
high and A4 is 297 wide x 210 high giving factor of 0.71 wide and and
high.

[jg]

Ah you're right. I remember now that's one of the preset reductions on
some photocopiers. So it's inverse 0.71 = 1.41... 1:141 yuk. You could
draw a scale - another braintwister (for me at least). Sometimes the
simplest things....

[Kerry C]

Divide by sq.root 2 = 1.414
Same as multiply by 0.707
.

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