US population hits maths milestone Figuring out the number of American residents got as easy as pi on Tuesday (local time) as the United States touched a rare mathematical and demographic milestone.
The Census Bureau said that the United States reached 314,159,265 residents, or the mathematical ratio pi times 100 million, shortly after 2.29 pm.
Pi, or 3.14159265, is the mathematical constant that is the ratio of a circle's circumference to its diameter. It often is approximated as 22/7.
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