We read every piece of feedback, and take your input very seriously.
To see all available qualifiers, see our documentation.
两组互相垂直的平行线,投针实验
平面内有两组互相垂直的平行线,做投针实验,求针与线不相交的概率
t:每组平行线之间的间隔
l:针的长度
There was an error while loading. Please reload this page.