Ways to determine $\pi$
3098
How are first digits of $\pi$ found?
104828
Show that $\cot \frac{\pi}{2m}\cot \frac{2\pi}{2m}\cot \frac{3\pi}{2m}...\cot \frac{(m-1)\pi}{2m}=1$
13592
How can $\pi$ be irrational if it can be calculated using an infinite series of rational numbers?
125523
How to find $\int_{0}^{\pi/2} \log ({1+\cos x}) dx$ using real-variable methods?
75731
Significance of $\pi$ in physics
85311
Proving that $e^{\pi}-{\pi}^e\lt 1$ without using a calculator
5679
Why is $2\pi i \neq 0?$
150843
Evaluation of $\int_0^{\pi/4} \sqrt{\tan x} \sqrt{1-\tan x}\,\,dx$
121071
Calculation of $\int^{\pi/2}_{0}\cos^{n}(x)\cos (nx)\,dx$, where $n\in \mathbb{N}$
21003
Comparing $\pi^e$ and $e^\pi$ without calculating them
124209
How is $\ln(-1) = i\pi$?
41191
How to prove this $\pi$ formula?
61794
Interesting and unexpected applications of $\pi$
148233
Proof that every circle has the ratio of $\pi$
17188
Simplify $\cos(n \pi)$ and $\sin(n \pi)$ when n is an integer
109900
Why is $e^{\pi \sqrt{163}}$ almost an integer?
60530
Locating tick marks at integral multiples of pi/2