1. 뷔퐁의 바늘실험
먼저 실 2개를 나란히 놓고 바늘을 던진다. 이때 원주율은 걸린 횟수 분의 던진 횟수 곱하기 2이다.
2. 공으로 구하기
더 정확하게 하려면 더 작은 공을 사용해야 한다.{탁구공550개 정도(지름5m기준)}
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