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Q: Is 3 pi irrational

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Since pi is irrational, any multiple of it is too.

Since pi is irrational , so the answer is infinity.

If a numerator and/or denominator in a fraction is irrational, the entire fraction is irrational. Since pi is irrational, pi divided by two is also irrational.

No, since Pi is an irrational number, 2(pi) would still be irrational.

Yes. 2*pi is irrational, pi is irrational, but their quotient is 2pi/pi = 2: not only rational, but integer.

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Since pi is irrational, any multiple of it is too.

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

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.

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.

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

Since pi is irrational , so the answer is infinity.

( pi ) x ( 3/pi ) = 3

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

It is irrational, just like pi

If a numerator and/or denominator in a fraction is irrational, the entire fraction is irrational. Since pi is irrational, pi divided by two is also irrational.

there is probably not one

It can. pi / sqrt(5) = an irrational number. However, it doesn't have to be: pi / pi = 1.

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