4. PI
π is a mathematical constant whose value is the ratio of any Euclidean plane circle´s circumference to its diameter; this is the same value as the ratio of a circle´s area to the square of its radius. It is approximately equal to 3.14159265 in the usual decimal notation. Many formulae from mathematics, science and engineering involve , which makes it one of the most important mathematical constants.
TODAY is "pi" day since it is the third month on its fourteenth day so, happy "pi" day.
a.
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