Why is PI considered irrational if it is already defined as ratio of circumference to diameter?
37642
Why is $\pi$ irrational if it is represented as $C/D$?
95145
Does $\exp(2ir\pi)$ equal $1$? What's wrong?
5679
Why is $2\pi i \neq 0?$
111094
Help with proving that $\pi$ is irrational
1877
Can an irrational number raised to an irrational power be rational?
118374
Is there a proof that $\pi$ is an irrational number?
151876
Is irrational times rational always irrational?
148233
Proof that every circle has the ratio of $\pi$
35837
How to prove that any (integer)$^{1/n}$ that isn't an integer, is irrational?
61794
Interesting and unexpected applications of $\pi$
120906
Is there a proof that $\pi \times e$ is irrational?
96805
Why is the Absolute Value of $3-π$ equal to $π - 3$
138162
Do Irrationals form a group?
77129
Density of irrationals
18380
Proof that Pi is constant (the same for all circles), without using limits
67031
use contradiction to prove that the square root of $p$ is irrational
87596
Is $\sum_{p}\frac{1}{p^{2}}$ irrational?