π (also written pi) is a mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space; this is the same value as the ratio of a circle's area to the square of its radius. (src: wikipedia)Celebration day is set as March 14 (3-14 in rememberance of 3.14 )
One of the jokes that people use to tell about Pi:
Q: What does a mathematician with eye cataract have?
A: A pee eye (Pi)
Cakes are round, but Pi are square.
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