No.
To be a rational number it must be an integer over another integer.
π is not an integer, nor can it be made into an integer by multiplying it by another integer, thus one twelfth of π is not a rational number.
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(pi) itself is an irrational number. The only multiples of it that can be rational are (pi) x (a rational number/pi) .
Pi is irrational.
No, it is not.
Yes, an irrational number would be any number over zero, Pi(π), Tau(τ), etc.
No. pi/2 is a fraction but, since pi is irrational, so it pi/2.