No not really - Pi, is approximately equal to 3.14159 and is an irrational number, which means that it cannot be expressed exactly as a ratio of two integers. Therefore cannot be expressed as a fraction.
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Where high accuracy is not required, it can be taken as 22/7 - though as an approximation.
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Pi written as an improper fraction is 22/722 over 7
Pi is not prime nor composite, instead, it is what is called irrational (It can't be written as a fraction or whole number.) Because only whole numbers can be prime, pi is not prime.
No. pi/2 is a fraction but, since pi is irrational, so it pi/2.
Pi is an irrational number. A rational number is one that can be expressed as a fraction (or ratio), e.g. 1/3. There are fractions that are near Pi, for example: 22/7 = 3.142857 (PI = 3.14159265...) A closer fraction is: 355/113 = 3.14159292 However whatever fraction you have, you will never get exactly PI. Hence it is irrational See the links for proofs that pi is irrational.
Irrational numbers. A good example of this is pi. If you were to write out pi as a decimal, the digits after the decimal point would go on forever.