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Q: Is 10 times pi rational

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

No, it is not.

No, it is not.

No, it is not.

No because 15 times pi is an irrational number

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

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.

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

A non-zero rational number (10) multiplied by an irrational number (pi) is always irrational.

e^pi ~ 23.14069.............., not rational

Any number times pi is irrational.

Pi is not rational it is irrational because it does not stop or repeat

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) .

No because it can't be expessed as a fraction

If you mean 0.3 times pi then it is an irrational number

I assume you mean 2 times pi. Since pi is irrational, 2 pi is also irrational.

No, it is not.

Pi is irrational.

Well, (pi) x (1/pi) = 1 .

Yes. 2 x 3.14 = 6.28 = 6 7/25 = 157/25 which is rational. If you are using 3.14 as an approximation to {pi}, then 2 x {pi} is not rational.

Yes. For example: a = 10 - pi b = pi Both are irrational; the sum a + b is 10.

No.

No, it is not.