But how do we know that pi is an irrational number? Rational numbers, which make up the majority of numbers we use in ...

PI DAY: Where to find Houston-area deals this Friday on pizza and pies Here is what you need to know about pi, the world's most famous irrational number. Pi is the ratio of a circle's ...

Its value is about 3.14159, but it is an irrational number, so its decimal representation goes on forever without repeating. Because Pi has an infinite number of decimal places, mathematicians are ...