# Is there any geometry behind the Basel problem?

I could find many beautiful and rigorous proofs for Euler's solution to the Basel problem here Different methods to compute $\sum\limits_{k=1}^\infty \frac{1}{k^2}$ (Basel problem)

But I am curious to know whether there are proofs by using geometry.

If anyone has proofs by geometry, please do share it with us.

• Here is an MO thread you may find interesting. – user296602 Mar 3 '18 at 2:55