Huh. Wait, they have differing star sizes on the flag?
...why? xD I assume the size of a *five-pointed stylised star* is not at a premium for astronomic accuracy.
my guess: it's the border around the New Zealand stars that forces the square roots into being. Australia doesn't have a border around its stars.
a few other examples:
https://en.wikipedia.org/wiki/Flag_of_Morocco#/media/File:Flag_of_Morocco_(construction_sheet).svg
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https://en.wikipedia.org/wiki/Flag_of_Nepal#/media/File:Nepal_Flag_Construction.png
