近几年各省市的中考题中,出现了一类与圆有关的动点问题.这类问题综合性强、题目灵活多变、难度较大,解答这类问题要求同学们具有较强的分析问题和解决问题的能力..A BCDEFOl图1..备用图备用图以下是两个典型的例题.一、一点动例1已知:如图1,AB是⊙O的一条弦,点C为A$B的中点,CD In the examination questions of various provinces and cities in recent years, there have been a series of dynamic points related to circles. These types of problems are comprehensive, the topics are flexible and difficult, and the answers to these questions require students to have a strong analysis. The problem and the ability to solve the problem.. A BCDEFOl Figure 1. Spare map Spare map The following are two typical examples. One, one dynamic example 1 is known: Figure 1, AB is a string of ⊙O, point C is Midpoint of A$B, CD