Buffon-s-Needle

Buffon’s needle is one of the oldest problems in geometric probability. First stated in 1777 by Georges-Louis Leclerc, Comte de Buffon, it involves dropping a needle onto a series of parallel lines (often described as a collection of parallel wooden floorboards). A remarkable outcome of this analysis is that the probabilities involved are directly related to Pi.

for more information :

https://datagenetics.com/blog/may42015/index.html

https://en.wikipedia.org/wiki/Buffon%27s_needle_problem