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3.14 is rational. It is 314 divided by 100, so it meets the definition of rationality, i.e. the division of two integers, the denominator not being zero.

pi, on the other hand, which starts with 3.14, but then continues infinitely, such as 3.1415926535897932384626433832795... (continuing forever...), is irrational and transcendental.

pi is irrational because it cannot be expressed as the ratio of two integers, the demoninator not being zero, and pi is transcendental because it cannot be expressed as the root of any polynomial with rational terms.

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Q: Is 3.14 a rational number or irrational number?
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