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Pi is the ratio of a circle’s circumference to its diameter. That is, if you measure a circle’s circumference and divide it by its diameter, you will always get the same number. This constant is called pi (π). Pi does not have an exact value because its digits after the decimal point continue infinitely. The most commonly used value is 3.14. For this reason, pi is sometimes referred to as the number “3.14”. History The number pi has fascinated humans for thousands of years. Around 4000 years ago