Ad: Pi (Math) Probably Irrational Definitely Not 22/7 Business Card
π (sometimes written pi) is a mathematical constant whose value is the ratio of any 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. π is approximately equal to 3.14159 in the usual decimal positional notation. It is most probably an irrational number which means that its value cannot be expressed exactly as a fraction. Make other do a double-take the next time you introduce yourself with these π business cards! myMathematician
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