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http://en.wikipedia.org/wiki/Pi
Today is national Pi day. Celebrating Pi a mathematical constant that is the ratio of a circle‘s circumference to its diameter, and is approximately equal to 3.14159. It has been represented by the Greek letter “?” since the mid-18th century, though it is also sometimes written as pi. ? is an irrational number, which means that it cannot be expressed exactly as a ratio of two integers