The story of the famous French mathematician Buffon: Throw a π, Buffon is a famous French mathematician. One day, he invited many good friends to play at home. Just as friends were having fun, Buffon suddenly took out a big blank sheet of paper. He drew parallel lines with equal distance on white paper. Then, he took out many small needles of equal length, each of which was half the distance between parallel lines. Buffon turned to everyone and said, "Well, please throw these little needles on the white paper at will." My friend felt very strange and didn't know what Pu Feng wanted to do. They looked at each other and had to throw small needles on white paper one by one. Buffon counted nervously while his friends were throwing balls. , and so on everyone has finished throwing. Buffon told everyone that he counted the number of shots, and a * * * shot 22 12 times, of which 704 times crossed the straight line. Divided by 22 12, we get 3. 142. Buffon said to everyone, "Friends, did you see it? This result is very close to pi. " Everyone wants to know what pi has to do with these random results. Buffon went on to say, "It seems that you still don't believe me? We can continue the experiment, and the result obtained each time is an approximation of pi. The more times we throw it, the closer the result is. " My friend threw it many times again. The result is still the approximate value of PI that Buffon said. This time my friends are really convinced! Later, people called this experiment "Buffon Experiment". 190 1, an Italian voted 3408 times, and the result was 3. 14 15929. Later, this experiment became one of the important topics in probability theory research. Feeling, being good at thinking and discovering can explore many unknown scientific fields. A famous French mathematician