Pi is the relationship between a circle circumference and diameter. If you the circuference and divide it to the diameter, you get pi, or about 3.14159. Pi is irrational, or never repeates or ends. Many people think that 22/7=pi, but that just not true. Pi has been first used by the Greeks, 2000 B.C.E. The Greeks used 25/8, or 3.125. This speread to the Romans, and they knew 22/7[3.14285714285...(The bolded numbers are the same digits as pi)] was closer to pi, but since eighths were easier to draw, they used 25/8 also. The Chinese was the closest in 1250 B.C.E. They found out about 22/7 and then calculated their own, 355/113(3.14159292035...). Today, the record of pi calculated was 1.2 trillion by Kanada in 2002! He had beaten his record by five times in 1999, 206 billion. My other post has 1000 digits. Just in case you need a few, here are the first 100.
3.
1415926535 8979323846 2643383279 5028841971 6939937510:50
5820974944 5923078164 0628620899 8628034825 3421170679:100
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