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Q: Is 3 times pi a rational number?

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3 times pi is an irrational number because it can't be expressed as a fraction

No; since pi is irrational if you multiply it by a rational number it is still irrational

3.1

A rational number is a fraction with an integer in the numerator, and a non-zero integer in the denominator. If you consider pi/2, pi/3, pi/4 (common 'fractions' of pi used in trigonometry) to be 'fractions', then these are not rational numbers.

No, 3 is a rational number. Pi and the square root of 2 are irrational numbers.

You can multiply any pair of rational numbers as well as any irrational number and its reciprocal (or a rational multiple of its reciprocal. Thus pi * 3/7*(1/pi) is rational.

pi is a transcendental (a special type of irrational) number whereas 3 is not only rational, but an integer.pi is a transcendental (a special type of irrational) number whereas 3 is not only rational, but an integer.pi is a transcendental (a special type of irrational) number whereas 3 is not only rational, but an integer.pi is a transcendental (a special type of irrational) number whereas 3 is not only rational, but an integer.

You might add (-pi/3), in which case you obtain zero. Or you can choose any other rational number, and subtract that number minus pi/3. For example, if you want the result to be 2, , the number you must add is (2 - pi/3).

Yes if the diameter is rational. But it need not be if the diameter is irrational. If the diameter is 3/pi units, for example, then the circumference will be (3/pi)*pi = 3 units.

Rational -1.(3 repeating) Any repeating decimals are rational. However, a number such as pi (3.141592654...) does not repeat or end.

A rational number can be expressed as a fraction, so any fraction is a rational number e.g. 3/4 A irrational number can NOT be expressed as a fraction. e.g. sqrt(2), pi

It is a rational decimal number in the form of 3.14 which is also the first 3 digits of pi

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