# When do you use pi 3.1?

The Greek letter ?, often spelled out pi in text, was first adopted for the number as an abbreviation of the Greek word for perimeter. It is a mathematical constant whose value is the ratio of any circle's circumference to its diameter and is approximately equal to 3.14159265, in the usual decimal notation. Pi is used in many mathematics, science and engineering formulae.
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 One third or 1/3 written as a decimal is 0.3333. If you want to find a decimal for any fraction just divide the top number by the bottom number. The number that you get will be your http://answers.ask.com/Reference/Other/what_is_1_3...
 Half of 1/3 is 1/6. In fractions, when you double the denominator (that's the number on the bottom) you cut the number in half. If you instead mean what is half of 13, the answer http://answers.ask.com/Reference/Other/what_is_hal...
 To find the percentage of 1/3 you need to divide denominator into the numerator. The 1 becomes 1.00. Divide the 1.00 by 3 and you will get your percentage. Don't forget to move the http://answers.ask.com/Reference/Other/what_percen...
 13 is a very superstitous number for some people. Owners of buildings that have mutliple floors will skip the 13th floor and go striaght to the next number. http://answers.ask.com/Reference/Dictionaries/what...
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