Why PI is an irrational number?

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Since my understanding of rational number says that it can expressed as fraction of 2 integers.

$Q = \frac{p}{q}$ where, $p,q$ belongs I

What I don't understand is how does PI fail to qualify these conditions?

Since, $\pi$ is an angle and

$\theta = \frac{circumference}{radius}$

So does $\pi$ could be expressed in same terms and we can always make a circle with integral circumference and radius and find the value of $\pi$.

Thus, $\pi$ should be a rational number. What am I missing?