What is pi? | Live Science

Pi is a quantity that relates a circle’s circumference to its diameter. Pi is an irrational quantity, which signifies that it is an actual quantity that can not be expressed by a easy fraction. That’s as a result of pi is what mathematicians name an “infinite decimal” — after the decimal level, the digits go on perpetually and ever.

Students are normally launched to the quantity pi as having an approximate worth of three.14 or 3.14159. Though it is an irrational quantity, some folks use rational expressions, equivalent to 22/7 or 333/106, to estimate pi. (These rational expressions are correct solely to a few decimal locations.) 


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