buffon 模拟图

说明：  Buffon投针实验18世纪，布丰提出以下问题：设我们有一个以平行且等距木纹铺成的地板（如图），现在随意抛一支长度比木纹之间距离小的针，求针和其中一条木纹相交的概率。并以此概率，布丰提出的一种计算圆周率的方法——随机投针法。这就是蒲丰投针问题
(buffonIn the 18th century, Buffon proposed the following question: Let us have a parallel and equidistant wood paved the floor (pictured), now free to throw a length of wood than the distance between the small needle, and a needle The probability of grain intersecting. And with this probability, Buffon proposed a method of calculating the pi - random acupuncture method. This is the problem of Po Feng investment)