![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/5/58/Buffon_needle.svg/640px-Buffon_needle.svg.png&w=640&q=50)
Buffon's needle problem
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In probability theory, Buffon's needle problem is a question first posed in the 18th century by Georges-Louis Leclerc, Comte de Buffon:[1]
- Suppose we have a floor made of parallel strips of wood, each the same width, and we drop a needle onto the floor. What is the probability that the needle will lie across a line between two strips?
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/58/Buffon_needle.svg/220px-Buffon_needle.svg.png)
Buffon's needle was the earliest problem in geometric probability to be solved;[2] it can be solved using integral geometry. The solution for the sought probability p, in the case where the needle length l is not greater than the width t of the strips, is
This can be used to design a Monte Carlo method for approximating the number π, although that was not the original motivation for de Buffon's question.[3] The seemingly unusual appearance of π in this expression occurs because the underlying probability distribution function for the needle orientation is rotationally symmetric.