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For entirely boring reasons, I was looking at the table of hat size
conversions appropriately located at http://hatsizes.com/
I used a simple regression to reverse engineer the equation from this
table, and it seems to be:
US_size = circumference_inches / pi + 0.037
So, the division by pi makes sense to me, but does anyone have any idea
where the + 0.037 comes from?
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