想象有两个运动质点位于一条线段的两端 ,作相对运动 ,无疑两质点会相遇 .再设想大量质点位于一个圆周上 ,一个质点接一个质点运动 ,结果运动沿圆周循环运动 ,永不相遇 ,这是多边形两种极限情况 ,那么对于其它n边形情况如何呢 ?下面我们作具体的分析 .问题 :有 3个花样滑冰演员 Imagine that two motion particles are located at both ends of a line segment for relative motion. There is no doubt that the two particles will meet. Then imagine that a large number of particles are located on a circle, and one particle moves after one particle. As a result, the motion moves in a circular motion and never meets. This is the two extreme cases of polygons, then what about the other n-gonads? Let’s make a specific analysis. Question: There are 3 figure skating actors