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Q: Is a pi number rational

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3.14 is a rational number pi is not. pi is not 3.14

(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.

It the radius is r then the area is pi*r*r - which is pi times a rational number. pi is an irrational number, so the multiple of pi and a rational number is irrational.

Any multiple of or addition to or subtraction from PI is an irrational number. PI divided by PI is 1, a rational number. So is PI times 0 = 0

Minus pi. Or minus pi plus any rational number. Here is how you can figure this out (call your unknown number "x", and let "r" stand for any rational number):x + pi = r To solve for "x", simply subtract pi from both sides. That gives you: x = r - pi

No.

No, it is not.

No 10*pi is not a rational number because it can't be expressed as a fraction

No 22*pi is not a rational number

No. pi/2 is a faction but it is not a rational number.

Yes. For example, if you take any truncated equivalent of pi then it will be rational.

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